lpd.buf is non-const and discards the const qualifier of zerobuffer.
This fixes -Wdiscarded-qualifiers observed with a variety of compilers, 
including GCC 5.2.
Note that this does not change the type of zerobuffer, and merely makes the 
intent explicit.

Signed-off-by: Ganesh Ajjanagadde <gajjanaga...@gmail.com>
---
 libavformat/format.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/format.c b/libavformat/format.c
index fd81d7a..ffddb13 100644
--- a/libavformat/format.c
+++ b/libavformat/format.c
@@ -175,7 +175,7 @@ AVInputFormat *av_probe_input_format3(AVProbeData *pd, int 
is_opened,
     const static uint8_t zerobuffer[AVPROBE_PADDING_SIZE];
 
     if (!lpd.buf)
-        lpd.buf = zerobuffer;
+        lpd.buf = (unsigned char *) zerobuffer;
 
     if (lpd.buf_size > 10 && ff_id3v2_match(lpd.buf, ID3v2_DEFAULT_MAGIC)) {
         int id3len = ff_id3v2_tag_len(lpd.buf);
-- 
2.5.2

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