vout: fix signedness warnings

include/vlc_vout_wrapper.h

@@ -86,7 +86,7 @@ VLC_API bool vout_ManageDisplay(vout_display_t *, bool allow_reset_pictures);
 
 VLC_API void vout_SetDisplayFullscreen(vout_display_t *, bool is_fullscreen);
 VLC_API void vout_SetDisplayFilled(vout_display_t *, bool is_filled);
-VLC_API void vout_SetDisplayZoom(vout_display_t *, int num, int den);
+VLC_API void vout_SetDisplayZoom(vout_display_t *, unsigned num, unsigned den);
 VLC_API void vout_SetWindowState(vout_display_t *, unsigned state);
 VLC_API void vout_SetDisplayAspect(vout_display_t *, unsigned dar_num, unsigned dar_den);
 VLC_API void vout_SetDisplayCrop(vout_display_t *, unsigned crop_num, unsigned crop_den, unsigned left, unsigned top, int right, int bottom);

src/video_output/display.c

@@ -301,8 +301,8 @@ struct vout_display_owner_sys_t {
 
     bool ch_zoom;
     struct {
-        int  num;
-        int  den;
+        unsigned num;
+        unsigned den;
     } zoom;
 
     bool ch_wm_state;
@@ -1141,7 +1141,7 @@ void vout_SetDisplayFilled(vout_display_t *vd, bool is_filled)
     }
 }
 
-void vout_SetDisplayZoom(vout_display_t *vd, int num, int den)
+void vout_SetDisplayZoom(vout_display_t *vd, unsigned num, unsigned den)
 {
     vout_display_owner_sys_t *osys = vd->owner.sys;