drivers/gpu/drm/i915/intel_sprite.c: fix build

gcc-4.4.4:

cc1: warnings being treated as errors
drivers/gpu/drm/i915/intel_sprite.c: In function 'intel_check_sprite_plane':
drivers/gpu/drm/i915/intel_sprite.c:767: error: 'src_x' may be used uninitialized in this function
drivers/gpu/drm/i915/intel_sprite.c:767: error: 'src_y' may be used uninitialized in this function
drivers/gpu/drm/i915/intel_sprite.c:767: error: 'src_w' may be used uninitialized in this function
drivers/gpu/drm/i915/intel_sprite.c:767: error: 'src_h' may be used uninitialized in this function

Fixes: 96d61a7 ("drm/i915: split intel_update_plane into check() and commit()")
Cc: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: akpm00

drivers/gpu/drm/i915/intel_sprite.c

@@ -747,7 +747,7 @@ intel_check_sprite_plane(struct drm_plane *plane,
 	struct drm_framebuffer *fb = state->base.fb;
 	int crtc_x, crtc_y;
 	unsigned int crtc_w, crtc_h;
-	uint32_t src_x, src_y, src_w, src_h;
+	uint32_t src_x = 0, src_y = 0, src_w = 0, src_h = 0;
 	struct drm_rect *src = &state->src;
 	struct drm_rect *dst = &state->dst;
 	const struct drm_rect *clip = &state->clip;