Do not check unsigned size is less than zero

The variables here are unsigned and as such, cannot have a negative
value. Use == 0 instead of <= 0 to make this cleaner.

Signed-off-by: Jouni Malinen <j@w1.fi>

wpa_supplicant/dbus/dbus_new_handlers.c

@@ -214,7 +214,7 @@ dbus_bool_t set_network_properties(struct wpa_supplicant *wpa_s,
 		} else if (entry.type == DBUS_TYPE_STRING) {
 			if (should_quote_opt(entry.key)) {
 				size = os_strlen(entry.str_value);
-				if (size <= 0)
+				if (size == 0)
 					goto error;
 
 				size += 3;

wpa_supplicant/dbus/dbus_old_handlers.c

@@ -884,7 +884,7 @@ DBusMessage * wpas_dbus_iface_set_network(DBusMessage *message,
 			if (should_quote_opt(entry.key)) {
 				size = os_strlen(entry.str_value);
 				/* Zero-length option check */
-				if (size <= 0)
+				if (size == 0)
 					goto error;
 				size += 3;  /* For quotes and terminator */
 				value = os_zalloc(size);

wpa_supplicant/events.c

@@ -1685,7 +1685,7 @@ int wpa_supplicant_fast_associate(struct wpa_supplicant *wpa_s)
 #else /* CONFIG_NO_SCAN_PROCESSING */
 	struct os_reltime now;
 
-	if (wpa_s->last_scan_res_used <= 0)
+	if (wpa_s->last_scan_res_used == 0)
 		return -1;
 
 	os_get_reltime(&now);