b43: Fix typo in firmware file name for 802.11 cores with rev 13

When the patch for the BCM4311 rev 2 was prepared, I misread the specs
and coded the wrong file name for the initvals firmware.
Signed-off-by: NLarry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/b43/main.c

@@ -1958,7 +1958,7 @@ static int b43_request_firmware(struct b43_wldev *dev)
 		if ((rev >= 5) && (rev <= 10))
 			filename = "b0g0initvals5";
 		else if (rev >= 13)
-			filename = "lp0initvals13";
+			filename = "b0g0initvals13";
 		else
 			goto err_no_initvals;
 		break;