staging: brcm80211: remove sparse warnings from mac80211_if.c

Some changes have been made to get rid of sparse warnings in the
source file mac80211_if.c.
Reported-by: NAaro Koskinen <aaro.koskinen@iki.fi>
Reviewed-by: NRoland Vossen <rvossen@broadcom.com>
Reviewed-by: NPieter-Paul Giesberts <pieterpg@broadcom.com>
Signed-off-by: NRoland Vossen <rvossen@broadcom.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/brcm80211/brcmsmac/mac80211_if.c

@@ -96,7 +96,7 @@ struct firmware_hdr {
 	u32 idx;
 };
 
-char *brcms_firmwares[MAX_FW_IMAGES] = {
+static const char * const brcms_firmwares[MAX_FW_IMAGES] = {
 	"brcm/bcm43xx",
 	NULL
 };
@@ -1012,7 +1012,7 @@ static void brcms_free(struct brcms_info *wl)
 	 * after calling unregister_netdev() .
 	 */
 	if (wl->regsva)
-		iounmap((void *)wl->regsva);
+		iounmap(wl->regsva);
 
 	wl->regsva = NULL;
 }
@@ -1596,7 +1596,7 @@ struct brcms_timer *brcms_init_timer(struct brcms_info *wl,
 	if (!t) {
 		wiphy_err(wl->wiphy, "wl%d: brcms_init_timer: out of memory\n",
 			  wl->pub->unit);
-		return 0;
+		return NULL;
 	}
 
 	init_timer(&t->timer);

drivers/staging/brcm80211/brcmsmac/mac80211_if.h

@@ -67,7 +67,7 @@ struct brcms_info {
 	spinlock_t isr_lock;	/* per-device ISR synchronization lock */
 
 	/* regsva for unmap in brcms_free() */
-	void *regsva;		/* opaque chip registers virtual address */
+	void __iomem *regsva;	/* opaque chip registers virtual address */
 
 	/* timer related fields */
 	atomic_t callbacks;	/* # outstanding callback functions */