wifi: b43: remove empty switch statement

There's a TODO here, just move the dependency on phy->rev
into the comment. Not that this driver is likely to get
any updates.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220904212910.ea00a892e41b.I709217fc307125f8670c7f6a9093111b46194131@changeid

drivers/net/wireless/broadcom/b43/phy_n.c

@@ -2479,11 +2479,7 @@ static void b43_nphy_gain_ctl_workarounds_rev19(struct b43_wldev *dev)
 
 static void b43_nphy_gain_ctl_workarounds_rev7(struct b43_wldev *dev)
 {
-	struct b43_phy *phy = &dev->phy;
-
-	switch (phy->rev) {
-	/* TODO */
-	}
+	/* TODO - should depend on phy->rev */
 }
 
 static void b43_nphy_gain_ctl_workarounds_rev3(struct b43_wldev *dev)