EXA: Fix crash with fill using 1x1 tile of depth < 8 (bug #24703).

Fixes http://bugs.freedesktop.org/show_bug.cgi?id=24703 .

Signed-off-by: Michel Dänzer <daenzer@vmware.com>
Reviewed-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Keith Packard <keithp@keithp.com>
(cherry picked from commit e06fa80400)

exa/exa_accel.c

@@ -1057,6 +1057,8 @@ exaFillRegionSolid (DrawablePtr	pDrawable, RegionPtr pRegion, Pixel pixel,
 		*(CARD16*)pExaPixmap->sys_ptr = pixel;
 		break;
 	    case 8:
+	    case 4:
+	    case 1:
 		*(CARD8*)pExaPixmap->sys_ptr = pixel;
 	    }
 

exa/exa_unaccel.c

@@ -736,6 +736,8 @@ exaGetPixmapFirstPixel (PixmapPtr pPixmap)
 	    return pixel;
 	}
     case 8:
+    case 4:
+    case 1:
 	{
 	    CARD8 pixel;