staging: rtl8188eu: Replace function name in string with __func__

Replace hard coded function name FillH2CCmd_88E with __func__
and break the line to avoid more then 80 characters line.
Issue found using checkpatch.pl
Signed-off-by: NDafna Hirschfeld <dafna3@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/hal/rtl8188e_cmd.c

@@ -67,7 +67,8 @@ static s32 FillH2CCmd_88E(struct adapter *adapt, u8 ElementID, u32 CmdLen, u8 *p
 
 
 	if (!adapt->bFWReady) {
-		DBG_88E("FillH2CCmd_88E(): return H2C cmd because fw is not ready\n");
+		DBG_88E("%s(): return H2C cmd because fw is not ready\n",
+			__func__);
 		return ret;
 	}