[PATCH V2] b43: Fix swatch warning

Swatch reports the following warning for main.c:

  CHECK   drivers/net/wireless/b43/main.c
drivers/net/wireless/b43/main.c +4115 b43_wireless_core_stop(7) warn: variable dereferenced before check 'dev'

After analysis, this is not a bug, but a false warning. Nonetheless,
a cleanup is in order to prevent some future janitor proposing
the wrong fix, as I did in my original patch.

Signed-off-by: Larry Finger <redacted>
---
V2 - Fix the warning without introducing a bug.

John,

As this is not a bug, please consider it for next.

Larry
---

 drivers/net/wireless/b43/main.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c
index 0628901..517be17 100644
--- a/drivers/net/wireless/b43/main.c
+++ b/drivers/net/wireless/b43/main.c

@@ -4131,10 +4131,13 @@ out_unlock:
  * because the core might be gone away while we unlocked the mutex. */
 static struct b43_wldev * b43_wireless_core_stop(struct b43_wldev *dev)
 {
-	struct b43_wl *wl = dev->wl;
+	struct b43_wl *wl;
 	struct b43_wldev *orig_dev;
 	u32 mask;
 
+	if (!dev)
+		return NULL;
+	wl = dev->wl;
 redo:
 	if (!dev || b43_status(dev) < B43_STAT_STARTED)
 		return dev;

-- 
1.7.3.4