avcodec/mpegvideo: drop emu edge check from chroma_4mv_motion_lowres()

This is in line with the other functions
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/mpegvideo.c

@@ -2387,7 +2387,6 @@ static inline void chroma_4mv_motion_lowres(MpegEncContext *s,
 
     offset = src_y * s->uvlinesize + src_x;
     ptr = ref_picture[1] + offset;
-    if (s->flags & CODEC_FLAG_EMU_EDGE) {
     if ((unsigned) src_x > FFMAX(h_edge_pos - (!!sx) - block_s, 0) ||
         (unsigned) src_y > FFMAX(v_edge_pos - (!!sy) - block_s, 0)) {
         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, ptr, s->uvlinesize,
@@ -2395,7 +2394,6 @@ static inline void chroma_4mv_motion_lowres(MpegEncContext *s,
         ptr = s->edge_emu_buffer;
         emu = 1;
     }
-    }
     sx = (sx << 2) >> lowres;
     sy = (sy << 2) >> lowres;
     pix_op[op_index](dest_cb, ptr, s->uvlinesize, block_s, sx, sy);