don't strstr on null/blank strings.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@7027 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/endpoints/mod_portaudio/mod_portaudio.c

@@ -1016,7 +1016,7 @@ static int get_dev_by_name(char *name, int in)
 
 		if (switch_strlen_zero(name)) {
 			match = 1;
-		} else if (strstr(pdi->name, name)) {
+		} else if (pdi && pdi->name && strstr(pdi->name, name)) {
 			match = 1;
 		}
 

src/mod/endpoints/mod_sofia/sofia_presence.c

@@ -1275,7 +1275,7 @@ void sofia_presence_handle_sip_i_message(int status,
 		const char *subject = "n/a";
 		char *msg = NULL;
 
-		if (sip->sip_content_type) {
+		if (sip->sip_content_type && !switch_strlen_zero(sip->sip_content_type->c_subtype)) {
 			if (strstr(sip->sip_content_type->c_subtype, "composing")) {
 				return;
 			}