drm/i915/fbc: s/false/0/

intel_fbc_check_plane() is supposed to an int, not a boolean.
So replace the bogus 'return false's with the correct 'return 0's.
These were accidental copy-paste mistakes when the code got moved
into intel_fbc_check_plane() from somewhere else tht did return
a boolean.

No functional issue here since false==0.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220413152852.7336-2-ville.syrjala@linux.intel.comReviewed-by: Manasi Navare <manasi.d.navare@intel.com>

drivers/gpu/drm/i915/display/intel_fbc.c

@@ -1094,7 +1094,7 @@ static int intel_fbc_check_plane(struct intel_atomic_state *state,
 	 */
 	if (DISPLAY_VER(i915) >= 12 && crtc_state->has_psr2) {
 		plane_state->no_fbc_reason = "PSR2 enabled";
-		return false;
+		return 0;
 	}
 
 	if (!pixel_format_is_valid(plane_state)) {
@@ -1120,7 +1120,7 @@ static int intel_fbc_check_plane(struct intel_atomic_state *state,
 	if (plane_state->hw.pixel_blend_mode != DRM_MODE_BLEND_PIXEL_NONE &&
 	    fb->format->has_alpha) {
 		plane_state->no_fbc_reason = "per-pixel alpha not supported";
-		return false;
+		return 0;
 	}
 
 	if (!intel_fbc_hw_tracking_covers_screen(plane_state)) {
@@ -1136,7 +1136,7 @@ static int intel_fbc_check_plane(struct intel_atomic_state *state,
 	if (DISPLAY_VER(i915) >= 9 &&
 	    plane_state->view.color_plane[0].y & 3) {
 		plane_state->no_fbc_reason = "plane start Y offset misaligned";
-		return false;
+		return 0;
 	}
 
 	/* Wa_22010751166: icl, ehl, tgl, dg1, rkl */
@@ -1144,7 +1144,7 @@ static int intel_fbc_check_plane(struct intel_atomic_state *state,
 	    (plane_state->view.color_plane[0].y +
 	     (drm_rect_height(&plane_state->uapi.src) >> 16)) & 3) {
 		plane_state->no_fbc_reason = "plane end Y offset misaligned";
-		return false;
+		return 0;
 	}
 
 	/* WaFbcExceedCdClockThreshold:hsw,bdw */