wmall: fix return type of dump_int_buffer()

Found-by: Dominique Leuenberger
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/wmalosslessdec.c

@@ -308,7 +308,7 @@ static void av_cold dump_context(WmallDecodeCtx *s)
     PRINT("num channels",        s->num_channels);
 }
 
-static int dump_int_buffer(int *buffer, int length, int delimiter)
+static void dump_int_buffer(int *buffer, int length, int delimiter)
 {
     int i;