p54: enhance rssi->dBm database import

This patch fixes several shortcomings of the
previous implementation. Features of the
rewrite include:

 * handles undocumented "0x0000" word at the
   start of the frequency table.
   (Affected some early? DELL 1450 USB devices
    and my Symbol 5GHz miniPCI card.)

 * supports more than just one reference point
   per band. (Also needed for the Symbol card.)

 * ships with default values in case the eeprom
   data is damaged, absent or unsupported.

Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/p54/main.c b/drivers/net/wireless/p54/main.c
index 622d27b6..0a78e66 100644
--- a/drivers/net/wireless/p54/main.c
+++ b/drivers/net/wireless/p54/main.c
@@ -642,10 +642,12 @@
 	kfree(priv->iq_autocal);
 	kfree(priv->output_limit);
 	kfree(priv->curve_data);
+	kfree(priv->rssi_db);
 	kfree(priv->used_rxkeys);
 	priv->iq_autocal = NULL;
 	priv->output_limit = NULL;
 	priv->curve_data = NULL;
+	priv->rssi_db = NULL;
 	priv->used_rxkeys = NULL;
 	ieee80211_free_hw(dev);
 }