fix indentation and remove whitespace after return

Originally committed as revision 18481 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/mpegvideo_common.h

@@ -316,7 +316,7 @@ if(s->quarter_sample)
                 av_log(s->avctx,AV_LOG_DEBUG,
                         "MPEG motion vector out of boundary\n");
                 if(!s->chroma_y_shift)
-                return ;
+                    return;
             }
             ff_emulated_edge_mc(s->edge_emu_buffer, ptr_y, s->linesize,
                                 17, 17+field_based,