drm/stm: ltdc: remove set but not used variable 'src_h'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/gpu/drm/stm/ltdc.c: In function 'ltdc_plane_atomic_check':
drivers/gpu/drm/stm/ltdc.c:694:13: warning:
 variable 'src_y' set but not used [-Wunused-but-set-variable]
  u32 src_x, src_y, src_w, src_h;
             ^
             ^
drivers/gpu/drm/stm/ltdc.c:694:6: warning:
 variable 'src_x' set but not used [-Wunused-but-set-variable]
  u32 src_x, src_y, src_w, src_h;
      ^

Signed-off-by: YueHaibing <[email protected]>
Signed-off-by: Benjamin Gaignard <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: YueHaibing

drivers/gpu/drm/stm/ltdc.c

@@ -691,16 +691,14 @@ static int ltdc_plane_atomic_check(struct drm_plane *plane,
 				   struct drm_plane_state *state)
 {
 	struct drm_framebuffer *fb = state->fb;
-	u32 src_x, src_y, src_w, src_h;
+	u32 src_w, src_h;
 
 	DRM_DEBUG_DRIVER("\n");
 
 	if (!fb)
 		return 0;
 
 	/* convert src_ from 16:16 format */
-	src_x = state->src_x >> 16;
-	src_y = state->src_y >> 16;
 	src_w = state->src_w >> 16;
 	src_h = state->src_h >> 16;