brcmfmac: fix size of the struct msgbuf_ring_status

This updates host struct to match the in-firmawre definition. It's a
cosmetic change as it only applies to the reserved struct space.

Fixes: c988b782 ("brcmfmac: print firmware reported ring status errors")
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/broadcom/brcm80211/brcmfmac/msgbuf.c

@@ -139,7 +139,7 @@ struct msgbuf_ring_status {
 	struct msgbuf_common_hdr	msg;
 	struct msgbuf_completion_hdr	compl_hdr;
 	__le16				write_idx;
-	__le32				rsvd0[5];
+	__le16				rsvd0[5];
 };
 
 struct msgbuf_rx_event {