Update RandR CRTC state if set_mode_major fails in set_desired_modes

Without this, RandR would report the CRTC and its outputs as enabled,
even though they were actually off due to the failure.

(Cherry picked from amdgpu commit 4dcda0b48d62944c841cd9540f4ad4c7ac8dee47)
Acked-by: Alex Deucher <alexander.deucher@amd.com>

src/drmmode_display.c

@@ -2833,6 +2833,8 @@ Bool drmmode_set_desired_modes(ScrnInfoPtr pScrn, drmmode_ptr drmmode,
 			} else {
 				xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
 					   "Failed to set mode on CRTC %d\n", c);
+				RRCrtcSet(crtc->randr_crtc, NULL, crtc->x, crtc->y,
+					  crtc->rotation, 0, NULL);
 			}
 		} else {
 			crtc->mode = crtc->desiredMode;