staging: sm750fb: use 'struct sm750_dev *' instead of 'void *'

Use proper 'struct sm750_dev *' type instead of 'void *'
Signed-off-by: NMike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/sm750fb/sm750.c

@@ -1178,7 +1178,7 @@ static void lynxfb_pci_remove(struct pci_dev *pdev)
 {
 	struct fb_info *info;
 	struct lynx_share *share;
-	void *sm750_dev;
+	struct sm750_dev *sm750_dev;
 	struct lynxfb_par *par;
 	int cnt;