mjpeg: Move code out of else branch

Simplify the control flow and spare some vertical space.

libavcodec/mjpegdec.c

@@ -1476,7 +1476,8 @@ int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
             av_log(avctx, AV_LOG_ERROR, "MJPEG packet 0x%x too big (0x%x/0x%x), corrupt data?\n",
                    start_code, unescaped_buf_size, buf_size);
             return AVERROR_INVALIDDATA;
-        } else {
+        }
+
         av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n",
                start_code, buf_end - buf_ptr);
 
@@ -1620,7 +1621,6 @@ not_the_end:
                "marker parser used %d bytes (%d bits)\n",
                (get_bits_count(&s->gb) + 7) / 8, get_bits_count(&s->gb));
     }
-    }
     if (s->got_picture) {
         av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
         goto eoi_parser;