avutil/motion_vector.h: fix coordinate types

See b0352b1997 for more information on the
feature.

doc/APIchanges

@@ -15,7 +15,7 @@ libavutil:     2014-08-09
 
 API changes, most recent first:
 
-2014-08-xx - xxxxxxx - lavu 54.5.100 - frame.h motion_vector.h
+2014-08-xx - xxxxxxx - lavu 54.6.100 - frame.h motion_vector.h
   Add AV_FRAME_DATA_MOTION_VECTORS side data and AVMotionVector structure
 
 2014-08-16 - xxxxxxx - lswr 1.1.100 - swresample.h

libavutil/motion_vector.h

@@ -33,13 +33,13 @@ typedef struct AVMotionVector {
      */
     uint8_t w, h;
     /**
-     * Absolute source position.
+     * Absolute source position. Can be outside the frame area.
      */
-    uint16_t src_x, src_y;
+    int16_t src_x, src_y;
     /**
-     * Absolute destination position.
+     * Absolute destination position. Can be outside the frame area.
      */
-    uint16_t dst_x, dst_y;
+    int16_t dst_x, dst_y;
     /**
      * Extra flag information.
      * Currently unused.

libavutil/version.h

@@ -56,7 +56,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR  54
-#define LIBAVUTIL_VERSION_MINOR   5
+#define LIBAVUTIL_VERSION_MINOR   6
 #define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \