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vp8/encoder/bitstream: fix int sanitizer warnings

implicit conversion from type 'unsigned int' of value 256
(32-bit, unsigned) to type 'unsigned char' changed the value to
0 (8-bit, unsigned)

BUG=webm:1615

Change-Id: I2b630bf22cad28b5a7a8a37f6938e6ebe12bc64e

--- a/vp8/encoder/bitstream.c

+++ b/vp8/encoder/bitstream.c

@@ -171,7 +171,7 @@

         validate_buffer(w->buffer + w->pos, 1, w->buffer_end, w->error);

-        w->buffer[w->pos++] = (lowvalue >> (24 - offset));

+        w->buffer[w->pos++] = (lowvalue >> (24 - offset)) & 0xff;

         lowvalue <<= offset;

         shift = count;

         lowvalue &= 0xffffff;