[SPARC]: Fix cg3 fb blanking.

cg3_blank() needs to clear the video enable register bit
to blank the screen, not set it.
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/video/cg3.c

@@ -209,7 +209,7 @@ cg3_blank(int blank, struct fb_info *info)
 	case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
 	case FB_BLANK_POWERDOWN: /* Poweroff */
 		val = sbus_readb(&regs->control);
-		val |= CG3_CR_ENABLE_VIDEO;
+		val &= ~CG3_CR_ENABLE_VIDEO;
 		sbus_writeb(val, &regs->control);
 		par->flags |= CG3_FLAG_BLANKED;
 		break;