include/uapi/sound/asound.h: include stdlib.h in userspace

Fixes compiler errors like:
error: field ‘trigger_tstamp’ has incomplete type
error: invalid application of ‘sizeof’ to incomplete t
ype ‘struct timespec’

Signed-off-by: Mikko Rapeli <[e-mail]>
Signed-off-by: Takashi Iwai <[e-mail]>

include/uapi/sound/asound.h

···
 
 #include <linux/types.h>
 
+#ifndef __KERNEL__
+#include <stdlib.h>
+#endif
 
 /*
  *  protocol version