mmal: Reduce buffer count to 30

Save some memory by allocating fewer buffers. This is still not optimal, but
close to where we can get with the current implementation.
Signed-off-by: Julian Scheel <julian@jusst.de>
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/hw/mmal/mmal_picture.h

@@ -28,7 +28,7 @@
 #include <interface/mmal/mmal.h>
 
 /* Think twice before changing this. Incorrect values cause havoc. */
-#define NUM_ACTUAL_OPAQUE_BUFFERS 40
+#define NUM_ACTUAL_OPAQUE_BUFFERS 30
 
 struct picture_sys_t {
     vlc_object_t *owner;