[calls] sip: origin: Drop comparison that always evaluates as true

[Evangelos Ribeiro Tzaras <devrtz src gnome org>]

commit 4188af73af2b897aadf258ab3d7c31e03745a0f9
Author: Evangelos Ribeiro Tzaras <devrtz fortysixandtwo eu>
Date:   Wed Jul 27 16:05:43 2022 +0200

    sip: origin: Drop comparison that always evaluates as true
    
    This avoids the following warning:
    
    ../plugins/sip/calls-sip-origin.c: In function ‘sip_r_register’:
    ../plugins/sip/calls-sip-origin.c:483:26: warning: the comparison will always evaluate as ‘true’ for the 
address of ‘m_url’ will never be NULL [-Waddress]
      483 |     if (sip->sip_contact && sip->sip_contact->m_url && sip->sip_contact->m_url->url_host) {
          |                          ^~
    In file included from /usr/include/sofia-sip-1.12/sofia-sip/nua.h:47,
                     from ../plugins/sip/calls-sip-util.h:28,
                     from ../plugins/sip/calls-sip-call.h:30,
                     from ../plugins/sip/calls-sip-origin.c:31:
    /usr/include/sofia-sip-1.12/sofia-sip/sip.h:477:23: note: ‘m_url’ declared here
      477 |   url_t               m_url[1];     /**< SIP URL */
          |                       ^~~~~
    ../plugins/sip/calls-sip-origin.c: In function ‘sip_callback’:
    ../plugins/sip/calls-sip-origin.c:779:23: warning: the comparison will always evaluate as ‘true’ for the 
address of ‘a_url’ will never be NULL [-Waddress]
      779 |     if (sip->sip_from && sip->sip_from->a_url &&
          |                       ^~
    /usr/include/sofia-sip-1.12/sofia-sip/sip.h:386:22: note: ‘a_url’ declared here
      386 |   url_t              a_url[1];      /**< URL */
          |                      ^~~~~

 plugins/sip/calls-sip-origin.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/plugins/sip/calls-sip-origin.c b/plugins/sip/calls-sip-origin.c
index 933422de..e35d8269 100644
--- a/plugins/sip/calls-sip-origin.c
+++ b/plugins/sip/calls-sip-origin.c
@@ -480,7 +480,7 @@ sip_r_register (int              status,
     if (!origin->contact_header)
       nua_get_params (nua, TAG_ANY (), TAG_END ());
 
-    if (sip->sip_contact && sip->sip_contact->m_url && sip->sip_contact->m_url->url_host) {
+    if (sip->sip_contact && sip->sip_contact->m_url->url_host) {
       if (g_strcmp0 (origin->own_ip, sip->sip_contact->m_url->url_host) == 0)
         return;
 
@@ -776,7 +776,7 @@ sip_callback (nua_event_t   event,
 
   switch (event) {
   case nua_i_invite:
-    if (sip->sip_from && sip->sip_from->a_url &&
+    if (sip->sip_from &&
         sip->sip_from->a_url->url_scheme &&
         sip->sip_from->a_url->url_user &&
         sip->sip_from->a_url->url_host)