ims_ipsec_pcscf: jump to error for clean up

(cherry picked from commit f0291728b7fb623faf1d4de0f3152e782a6782ae)

src/modules/ims_ipsec_pcscf/cmd.c

@@ -272,7 +272,7 @@ static int fill_contact(
 
 				if((srcip = pkg_malloc(50)) == NULL) {
 					LM_ERR("Error allocating memory for source IP address\n");
-					return -1;
+					goto error;
 				}
 
 				memcpy(srcip, alias_s.s, ci->received_host.len);