Use sizeof(variable) instead of sizeof(type)

vp10/common/reconintra.c

vp10/encoder/encodeframe.c

vp10/encoder/extend.c

vp10/encoder/rdopt.c

vp10/encoder/resize.c

vp9/common/vp9_reconintra.c

vp9/encoder/vp9_encodeframe.c

vp9/encoder/vp9_extend.c

vp9/encoder/vp9_rdopt.c

vp9/encoder/vp9_resize.c