[core] Coverity fixes

* [core] Coverity 1518099, 1518097, 1518098 (Unchecked return value from library)

* [core] Coverity 1468551 Unchecked return value

* [core] Coverity 1468293 Unchecked return value

* [core] Coverity 1468274 Explicit null dereferenced

* [core] Coverity 1395588 Unchecked return value

* [core] Coverity 1395515 Logically dead code

* [core] Coverity 1364984 Result is not floating-point

* [core] Coverity 1395554, 1468440 Dereference before null check

* [core] Coverity 1024487 Dereference after null check

* [core] Coverity 1024872 Unchecked return value

* [core] Coverity 1025822 Unchecked return value

* [core] Coverity 1025823 Unchecked return value

* [core] Coverity 1087637, 1346467, 1087638 Unchecked return value

* [core] Coverity 1107607 Unchecked return value

* [core] Coverity 1210777 Unchecked return value

* [core] Coverity 1227670 Dereference before null check

* [core] Coverity 1024551 Logically dead code

* [core] Coverity 1024560 Logically dead code

* [core] Coverity 1024664 Operands don't affect result

* [core] Coverity 1364957 Dereference after null check

* [core] Coverity 1395572 Logically dead code

* [core] Coverity 1412459 Unchecked return value

* [core] Coverity 1412490 Unchecked return value

* [core] Coverity 1395515/2 Logically dead code

* [core] Coverity cleanup

src/switch_cpp.cpp

@@ -98,6 +98,7 @@ SWITCH_DECLARE(Event *) EventConsumer::pop(int block, int timeout)
 	void *pop = NULL;
 	Event *ret = NULL;
 	switch_event_t *event;
+	switch_status_t res;
 
 	if (!ready) {
 		return NULL;
@@ -105,14 +106,16 @@ SWITCH_DECLARE(Event *) EventConsumer::pop(int block, int timeout)
 
 	if (block) {
 		if (timeout > 0) {
-			switch_queue_pop_timeout(events, &pop, (switch_interval_time_t) timeout * 1000); // millisec rather than microsec
+			res = switch_queue_pop_timeout(events, &pop, (switch_interval_time_t) timeout * 1000); // millisec rather than microsec
 		} else {
-			switch_queue_pop(events, &pop);
+			res = switch_queue_pop(events, &pop);
 		}
 	} else {
-		switch_queue_trypop(events, &pop);
+		res = switch_queue_trypop(events, &pop);
 	}
 
+	(void)res;
+
 	if ((event = (switch_event_t *) pop)) {
 		ret = new Event(event, 1);
 	}
@@ -138,9 +141,7 @@ SWITCH_DECLARE(void) EventConsumer::cleanup()
 
 	node_index = 0;
 
-	if (events) {
-		switch_queue_interrupt_all(events);
-	}
+	switch_queue_interrupt_all(events);
 
 	while(switch_queue_trypop(events, &pop) == SWITCH_STATUS_SUCCESS) {
 		switch_event_t *event = (switch_event_t *) pop;