video: fbdev: radeonfb: remove set but not used variable '‘cSync’'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/video/fbdev/aty/radeon_base.c: In function
‘radeonfb_set_par’:
drivers/video/fbdev/aty/radeon_base.c:1653:48: warning: variable
‘cSync’ set but not used [-Wunused-but-set-variable]

It is never used, and so can be removed.
Signed-off-by: yu kuai <yukuai3@huawei.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: zhengbin <zhengbin13@huawei.com>
Cc: yi.zhang <yi.zhang@huawei.com>
[b.zolnierkie: patch summary fixups]
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200119121730.10701-4-yukuai3@huawei.com

drivers/video/fbdev/aty/radeon_base.c

@@ -1650,7 +1650,7 @@ static int radeonfb_set_par(struct fb_info *info)
 	struct fb_var_screeninfo *mode = &info->var;
 	struct radeon_regs *newmode;
 	int hTotal, vTotal, hSyncStart, hSyncEnd,
-	    vSyncStart, vSyncEnd, cSync;
+	    vSyncStart, vSyncEnd;
 	u8 hsync_adj_tab[] = {0, 0x12, 9, 9, 6, 5};
 	u8 hsync_fudge_fp[] = {2, 2, 0, 0, 5, 5};
 	u32 sync, h_sync_pol, v_sync_pol, dotClock, pixClock;
@@ -1730,8 +1730,6 @@ static int radeonfb_set_par(struct fb_info *info)
 	else if (vsync_wid > 0x1f)	/* max */
 		vsync_wid = 0x1f;
 
-	cSync = mode->sync & FB_SYNC_COMP_HIGH_ACT ? (1 << 4) : 0;
-
 	format = radeon_get_dstbpp(depth);
 	bytpp = mode->bits_per_pixel >> 3;