staging: rtl8723bs: remove space after function name

Adhere to Linux kernel coding style.

Reported by checkpatch:

WARNING: space prohibited between function name and open parenthesis
Signed-off-by: NSevinj Aghayeva <sevinj.aghayeva@gmail.com>
Link: https://lore.kernel.org/r/86494fef795f1c3e28c55e556d68b407dadd1488.1649128267.git.sevinj.aghayeva@gmail.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723bs/core/rtw_mlme_ext.c

@@ -2388,7 +2388,7 @@ void issue_probersp(struct adapter *padapter, unsigned char *da, u8 is_valid_p2p
 				pframe += ssid_ielen_diff;
 				pattrib->pktlen += ssid_ielen_diff;
 			}
-			kfree (buf);
+			kfree(buf);
 		}
 	} else {
 		/* timestamp will be inserted by hardware */