* changes:
vp8_regular_quantize_b_sse2: remove dead init
vp8cx_pick_filter_level*: remove dead inits
vp8_decode_frame: remove dead increment
rdopt: remove dead stores
find_next_key_frame: remove dead init & store
multiframe_quality_enhance_block: remove dead stores
vp8_print_modes_and_motion_vectors: remove dead stores