fbdev: chipsfb: remove set but not used variable 'size'

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

drivers/video/fbdev/chipsfb.c: In function 'chipsfb_pci_init':
drivers/video/fbdev/chipsfb.c:352:22: warning:
variable 'size' set but not used [-Wunused-but-set-variable]

Fixes: 8c8709334cec ("[PATCH] ppc32: Remove CONFIG_PMAC_PBOOK").
Signed-off-by: YueHaibing <[e-mail]>
Acked-by: Michael Ellerman <[e-mail]>
Cc: Daniel Vetter <[e-mail]>
Cc: Christophe Leroy <[e-mail]>
[b.zolnierkie: minor commit summary and description fixups]
Signed-off-by: Bartlomiej Zolnierkiewicz <[e-mail]>

drivers/video/fbdev/chipsfb.c

···
 static int chipsfb_pci_init(struct pci_dev *dp, const struct pci_device_id *ent)
 {
 	struct fb_info *p;
-	unsigned long addr, size;
+	unsigned long addr;
 	unsigned short cmd;
 	int rc = -ENODEV;
 
···
 	if ((dp->resource[0].flags & IORESOURCE_MEM) == 0)
 		goto err_disable;
 	addr = pci_resource_start(dp, 0);
-	size = pci_resource_len(dp, 0);
 	if (addr == 0)
 		goto err_disable;