[sr-dev] [kamailio/kamailio] sms: fix compiler warning #612 (#617)

[Victor Seva]

* show error message if error in write

> 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.
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/617

-- Commit Summary --

  * sms: fix compiler warning #612

-- File Changes --

    M modules/sms/libsms_modem.c (4)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/617.patch
https://github.com/kamailio/kamailio/pull/617.diff

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