[sr-dev] [kamailio/kamailio] Fix or slience warnings given by Clang (#637)

[Mikko Lehto]

```
CC (clang38) [M ims_dialog.so]          dlg_hash.o
dlg_hash.c:674:37: warning: equality comparison with extraneous parentheses [-Wparentheses-equality]
            if ((d_entry_out->first == d_entry_out->last)) {
                 ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
dlg_hash.c:674:37: note: remove extraneous parentheses around the comparison to silence this warning
            if ((d_entry_out->first == d_entry_out->last)) {
                ~                   ^                   ~
dlg_hash.c:674:37: note: use '=' to turn this equality comparison into an assignment
            if ((d_entry_out->first == d_entry_out->last)) {
                                    ^~
                                    =

CC (clang38) [M ims_qos.so]             rx_avp.o
rx_avp.c:492:16: warning: comparison of unsigned expression >= 0 is always true [-Wtautological-compare]
        if (bandwidth >= 0) {
            ~~~~~~~~~ ^  ~
rx_avp.c:504:16: warning: comparison of unsigned expression >= 0 is always true [-Wtautological-compare]
        if (bandwidth >= 0) {
            ~~~~~~~~~ ^  ~

CC (clang38) [M ims_registrar_scscf.so]         save.o
save.c:114:21: warning: comparison of unsigned expression >= 0 is always true [-Wtautological-compare]
    if (expires_hdr >= 0)
        ~~~~~~~~~~~ ^  ~
```
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/637

-- Commit Summary --

  * modules/ims_auth lib/ims: use header type instead of header flag
  * modules/ims_qos modules/ims_registrar_scscf: fix comparison of unsigned expression
  * modules/ims_dialog: fix clang warning -Wparentheses-equality

-- File Changes --

    M lib/ims/ims_getters.c (6)
    M modules/ims_auth/utils.c (4)
    M modules/ims_dialog/dlg_hash.c (2)
    M modules/ims_qos/rx_avp.c (4)
    M modules/ims_registrar_scscf/save.c (2)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/637.patch
https://github.com/kamailio/kamailio/pull/637.diff

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