shithub: libvpx

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bitreader/writer: Change shift to signed

Silences several legal but suspicious unsigned overflows found with
clang -fsanitize=integer.

Change-Id: I69399751492a183167932b0a10751c433c32ca7b

--- a/vpx_dsp/bitreader.h

+++ b/vpx_dsp/bitreader.h

@@ -98,7 +98,7 @@

   }

   {

-    register unsigned int shift = vpx_norm[range];

+    register int shift = vpx_norm[range];

     range <<= shift;

     value <<= shift;

     count -= shift;

--- a/vpx_dsp/bitwriter.h

+++ b/vpx_dsp/bitwriter.h

@@ -35,7 +35,7 @@

   int count = br->count;

   unsigned int range = br->range;

   unsigned int lowvalue = br->lowvalue;

-  register unsigned int shift;

+  register int shift;

   split = 1 + (((range - 1) * probability) >> 8);