Add curly brackets to prevent coding errors

This change shuts the "suspicious semicolon" warning.
Signed-off-by: Guilherme Maciel Ferreira <guilherme.maciel.ferreira@gmail.com>

src/MQTTAsync.c

@@ -798,7 +798,9 @@ int MQTTAsync_restoreCommands(MQTTAsyncs* client)
 			int buflen;
 					
 			if (strncmp(msgkeys[i], PERSISTENCE_COMMAND_KEY, strlen(PERSISTENCE_COMMAND_KEY)) != 0)
+			{
 				;
+			}
 			else if ((rc = c->persistence->pget(c->phandle, msgkeys[i], &buffer, &buflen)) == 0)
 			{
 				MQTTAsync_queuedCommand* cmd = MQTTAsync_restoreCommand(buffer, buflen);
@@ -1114,7 +1116,9 @@ int MQTTAsync_processCommand(void)
 		{
 			if ((cmd->command.type == PUBLISH || cmd->command.type == SUBSCRIBE || cmd->command.type == UNSUBSCRIBE) &&
 				cmd->client->c->outboundMsgs->count >= MAX_MSG_ID - 1)
+			{
 				; /* no more message ids available */
+			}
 			else
 			{
 				command = cmd;

src/MQTTPersistence.c

@@ -187,9 +187,13 @@ int MQTTPersistence_restore(Clients *c)
 		while (rc == 0 && i < nkeys)
 		{
 			if (strncmp(msgkeys[i], PERSISTENCE_COMMAND_KEY, strlen(PERSISTENCE_COMMAND_KEY)) == 0)
+			{
 				;
+			}
 			else if (strncmp(msgkeys[i], PERSISTENCE_QUEUE_KEY, strlen(PERSISTENCE_QUEUE_KEY)) == 0)
+			{
 				;
+			}
 			else if ((rc = c->persistence->pget(c->phandle, msgkeys[i], &buffer, &buflen)) == 0)
 			{
 				MQTTPacket* pack = MQTTPersistence_restorePacket(buffer, buflen);
@@ -618,7 +622,9 @@ int MQTTPersistence_restoreMessageQueue(Clients* c)
 			int buflen;
 					
 			if (strncmp(msgkeys[i], PERSISTENCE_QUEUE_KEY, strlen(PERSISTENCE_QUEUE_KEY)) != 0)
+			{
 				;
+			}
 			else if ((rc = c->persistence->pget(c->phandle, msgkeys[i], &buffer, &buflen)) == 0)
 			{
 				MQTTPersistence_qEntry* qe = MQTTPersistence_restoreQueueEntry(buffer, buflen);
@@ -633,7 +639,9 @@ int MQTTPersistence_restoreMessageQueue(Clients* c)
 				}
 			}
 			if (msgkeys[i])
+			{
 				free(msgkeys[i]);
+			}
 			i++;
 		}
 		if (msgkeys != NULL)