1. Fixed compiler warnings

2. Fixed crash that occurs if db is locked

meshcore/KVM/Linux/linux_tile.c

@@ -331,11 +331,11 @@ int getTileAt(int x, int y, void** buffer, long long *bufferSize, void *desktop,
 	}
 
 	int retval = 0;
-	int firstTime = 1;
-
 #if MAX_TILE_SIZE == 0
 	retval = calc_opt_compr_send(x, y, captureWidth, captureHeight, desktop, desktopsize, buffer, bufferSize);
 #else
+	int firstTime = 1;
+
 	//This loop is used to adjust the COMPRESSION_RATIO. This loop runs only once most of the time.
 	do {
 		//retval here is 0 if everything was good. It is > 0 if it contains the size of the jpeg that was created and not sent.