iwl3945: initialize is_valid_rtc_data_addr function pointer

Initialize is_valid_rtc_data_addr function pointer for iwl3945 to
prevent a NULL pointer dereference in iwl_dump_nic_error_log.

Signed-off-by: Jason Andryuk <jandryuk@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-3945.c

@@ -2747,6 +2747,7 @@ static struct iwl_lib_ops iwl3945_lib = {
 		.query_addr = iwlcore_eeprom_query_addr,
 	},
 	.send_tx_power	= iwl3945_send_tx_power,
+	.is_valid_rtc_data_addr = iwl3945_hw_valid_rtc_data_addr,
 };
 
 static struct iwl_hcmd_utils_ops iwl3945_hcmd_utils = {