decodeframe.c: fix include guards
decodeframe.c: fix include guards

Change-Id: I69d1c4b63960b46affb3f907fe8a1385f0de8948

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