staging: fwserial: minor coding style fix

Fixes this checkpatch warning
WARNING: Integer promotion: Using 'h' in '%04hx' is unnecessary
Signed-off-by: Lee Gibson <leegib@gmail.com>
Link: https://lore.kernel.org/r/20210226114800.316897-1-leegib@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/fwserial/fwserial.c

@@ -2632,7 +2632,7 @@ static int fwserial_parse_mgmt_write(struct fwtty_peer *peer,
 
 	rcode = RCODE_COMPLETE;
 
-	fwtty_dbg(&peer->unit, "mgmt: hdr.code: %04hx\n", pkt->hdr.code);
+	fwtty_dbg(&peer->unit, "mgmt: hdr.code: %04x\n", pkt->hdr.code);
 
 	switch (be16_to_cpu(pkt->hdr.code) & FWSC_CODE_MASK) {
 	case FWSC_VIRT_CABLE_PLUG: