b43legacy: Fix sparse warnings

Sparse yields the following warnings for b43legacy:

  CHECK   drivers/net/wireless/b43legacy/phy.c
drivers/net/wireless/b43legacy/phy.c:1304:31: warning: potentially expensive pointer subtraction
drivers/net/wireless/b43legacy/phy.c:1304:31: warning: potentially expensive pointer subtraction
drivers/net/wireless/b43legacy/phy.c:1304:31: warning: potentially expensive pointer subtraction
  CHECK   drivers/net/wireless/b43legacy/debugfs.c
drivers/net/wireless/b43legacy/debugfs.c:243:9: warning: memset with byte count of 131072
Signed-off-by: NLarry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/b43legacy/debugfs.c

@@ -211,7 +211,7 @@ static ssize_t b43legacy_debugfs_read(struct file *file, char __user *userbuf,
 	struct b43legacy_dfs_file *dfile;
 	ssize_t uninitialized_var(ret);
 	char *buf;
-	const size_t bufsize = 1024 * 128;
+	const size_t bufsize = 1024 * 16; /* 16 KiB buffer */
 	const size_t buforder = get_order(bufsize);
 	int err = 0;
 

drivers/net/wireless/b43legacy/phy.c

@@ -1296,12 +1296,10 @@ void b43legacy_lo_write(struct b43legacy_wldev *dev,
 	/* Sanity check. */
 	if (pair->low < -8 || pair->low > 8 ||
 	    pair->high < -8 || pair->high > 8) {
-		struct b43legacy_phy *phy = &dev->phy;
 		b43legacydbg(dev->wl,
 		       "WARNING: Writing invalid LOpair "
-		       "(low: %d, high: %d, index: %lu)\n",
-		       pair->low, pair->high,
-		       (unsigned long)(pair - phy->_lo_pairs));
+		       "(low: %d, high: %d)\n",
+		       pair->low, pair->high);
 		dump_stack();
 	}
 #endif