[sr-dev] [kamailio/kamailio] compilation warnings (#612)

[Victor Seva]

>From travis gcc build https://s3.amazonaws.com/archive.travis-ci.org/jobs/129410409/log.txt
clang build https://s3.amazonaws.com/archive.travis-ci.org/jobs/129410410/log.txt
```
CC (gcc) [M corex.so]		corex_mod.o
corex_mod.c: In function 'w_file_read':
corex_mod.c:352:2: warning: ignoring return value of 'fread', declared with attribute warn_unused_result [-Wunused-result]
  fread(content, fsize, 1, f);
  ^
CC (gcc) [M corex.so]		corex_rpc.o
```
```
CC (clang) [M corex.so]		corex_mod.o
corex_mod.c:352:2: warning: ignoring return value of function declared with warn_unused_result attribute [-Wunused-result]
        fread(content, fsize, 1, f);
        ^~~~~ ~~~~~~~~~~~~~~~~~~~~
1 warning generated.
```

```
CC (clang) [M mediaproxy.so]		mediaproxy.o
mediaproxy.c:1929:27: warning: expression which evaluates to zero treated as a null pointer constant of type 'void *' [-Wnon-literal-null-conversion]
        *_params->param = MPInactive;
                          ^~~~~~~~~~
1 warning generated.
```

```
CC (gcc) [L libsrutils.so.1.0]		sha256.o
sha256.c: In function 'sr_SHA256_Final':
sha256.c:613:3: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
   *(sha2_word64*)&context->buffer[SHA256_SHORT_BLOCK_LENGTH] = context->bitcount;
   ^
sha256.c: In function 'SHA512_Last':
sha256.c:930:2: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
  *(sha2_word64*)&context->buffer[SHA512_SHORT_BLOCK_LENGTH] = context->bitcount[1];
  ^
sha256.c:931:2: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
  *(sha2_word64*)&context->buffer[SHA512_SHORT_BLOCK_LENGTH+8] = context->bitcount[0];
  ^
LD (gcc) [L libsrutils.so.1.0]		libsrutils.so.1.0
```

```
CC (gcc) [M sms.so]		libsms_modem.o
libsms_modem.c: In function 'put_command':
libsms_modem.c:77:2: warning: ignoring return value of 'write', declared with attribute warn_unused_result [-Wunused-result]
  write(mdm->fd,cmd,cmd_len);
  ^
CC (gcc) [M sms.so]		sms_funcs.o
```

```
CC (clang) [M sms.so]		libsms_modem.o
libsms_modem.c:77:2: warning: ignoring return value of function declared with warn_unused_result attribute [-Wunused-result]
        write(mdm->fd,cmd,cmd_len);
        ^~~~~ ~~~~~~~~~~~~~~~~~~~
1 warning generated.
```

```
CC (gcc) [M dmq_usrloc.so]		usrloc_sync.o
usrloc_sync.c: In function 'usrloc_dmq_handle_msg':
usrloc_sync.c:403:12: warning: 'reg_id' may be used uninitialized in this function [-Wmaybe-uninitialized]
  ci.reg_id = reg_id;
            ^
usrloc_sync.c:401:13: warning: 'methods' may be used uninitialized in this function [-Wmaybe-uninitialized]
  ci.methods = methods;
             ^
usrloc_sync.c:405:19: warning: 'last_modified' may be used uninitialized in this function [-Wmaybe-uninitialized]
  ci.last_modified = last_modified;
                   ^
usrloc_sync.c:394:7: warning: 'q' may be used uninitialized in this function [-Wmaybe-uninitialized]
  ci.q = q;
       ^
usrloc_sync.c:399:12: warning: 'cflags' may be used uninitialized in this function [-Wmaybe-uninitialized]
  ci.cflags = cflags;
            ^
usrloc_sync.c:397:11: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized]
  ci.flags = flags;
           ^
usrloc_sync.c:396:10: warning: 'cseq' may be used uninitialized in this function [-Wmaybe-uninitialized]
  ci.cseq = cseq;
          ^
usrloc_sync.c:393:13: warning: 'expires' may be used uninitialized in this function [-Wmaybe-uninitialized]
  ci.expires = expires;
             ^
usrloc_sync.c:407:2: warning: 'action' may be used uninitialized in this function [-Wmaybe-uninitialized]
  switch(action) {
  ^
make[3]: 'libsrutils.so.1.0' is up to date.
```

```
CC (gcc) [M dispatcher.so]		dispatch.o
dispatch.c: In function 'ds_set_attrs':
dispatch.c:263:8: warning: 'tmp_rweight' may be used uninitialized in this function [-Wmaybe-uninitialized]
    int tmp_rweight;
        ^
make[3]: 'libkmi.so.1.0' is up to date.
```

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