Don't initialize globals to zero (or NULL)

Some compilers and linkers aren't smart enough to optimize this,
as global variables are implictly initialized to zero.  As a
result, binaries are a bit smaller as more goes in the .bss and
less in the text section.

git-svn-id: https://svn.musicpd.org/mpd/trunk@5254 09075e82-0dd4-0310-85a5-a0d7c8717e4f

src/audioOutput.h

@@ -27,18 +27,7 @@
 #include "conf.h"
 #include "utils.h"
 
-#define DISABLED_AUDIO_OUTPUT_PLUGIN(plugin) \
-	AudioOutputPlugin plugin = { \
-		NULL, \
-		NULL, \
-		NULL, \
-		NULL, \
-		NULL, \
-		NULL, \
-		NULL, \
-		NULL, \
-		NULL \
-	};
+#define DISABLED_AUDIO_OUTPUT_PLUGIN(plugin) AudioOutputPlugin plugin;
 
 typedef struct _AudioOutput AudioOutput;