Change to use correct type
Change to use correct type

This commit changes to use int instead of unsigned for a variable used in
inverse quantization.

Ported from libvpx/master: d3fe3b2abb90caf87f76e46d83a2acfcfcc5b687

Change-Id: I8f0ff5f80c9e68d52425265ef177357c65ead1e2

mbebenita/aom,mbebenita/aom,luctrudeau/aom,mbebenita/aom,GrokImageCompression/aom,GrokImageCompression/aom,luctrudeau/aom,GrokImageCompression/aom,mbebenita/aom,shacklettbp/aom,shacklettbp/aom,mbebenita/aom,smarter/aom,mbebenita/aom,smarter/aom,shacklettbp/aom,GrokImageCompression/aom,shacklettbp/aom,smarter/aom,luctrudeau/aom,shacklettbp/aom,GrokImageCompression/aom,luctrudeau/aom,smarter/aom,smarter/aom,mbebenita/aom,smarter/aom,shacklettbp/aom,luctrudeau/aom,GrokImageCompression/aom,mbebenita/aom,mbebenita/aom,luctrudeau/aom