fix ci test

Author: leandromoreira

0_hello_world.c

@@ -28,7 +28,7 @@ static void save_gray_frame(unsigned char *buf, int wrap, int xsize, int ysize,
 
 int main(int argc, const char *argv[])
 {
-  a
+
   if (argc < 2) {
     printf("You need to specify a media file.\n");
     return -1;