iwlegacy: use FH39_ prefix in 3945 code

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
diff --git a/drivers/net/wireless/iwlegacy/3945.h b/drivers/net/wireless/iwlegacy/3945.h
index 33233ab..ed367bb 100644
--- a/drivers/net/wireless/iwlegacy/3945.h
+++ b/drivers/net/wireless/iwlegacy/3945.h
@@ -481,8 +481,8 @@
 		addr < IL39_RTC_DATA_UPPER_BOUND);
 }
 
-/* Base physical address of il3945_shared is provided to FH_TSSR_CBB_BASE
- * and &il3945_shared.rx_read_ptr[0] is provided to FH_RCSR_RPTR_ADDR(0) */
+/* Base physical address of il3945_shared is provided to FH39_TSSR_CBB_BASE
+ * and &il3945_shared.rx_read_ptr[0] is provided to FH39_RCSR_RPTR_ADDR(0) */
 struct il3945_shared {
 	__le32 tx_base_ptr[8];
 } __packed;