cdef.c: reduce scope of locals
cdef.c: reduce scope of locals

Change-Id: I6eca9ab77cf48c5b027319a25c59b36b9c0c4313

GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom