staging: mt7621-mmc: fix spelling mistake: "Illgal" -> "Illegal"

Trivial fix to another spelling mistake in N_MSG message text
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-mmc/sd.c

@@ -388,7 +388,7 @@ static void msdc_dump_io_resp(struct msdc_host *host, u32 resp)
 	if (flags & (1 << 7))
 		N_MSG(RSP, "[IO] COM_CRC_ERR");
 	if (flags & (1 << 6))
-		N_MSG(RSP, "[IO] Illgal command");
+		N_MSG(RSP, "[IO] Illegal command");
 	if (flags & (1 << 3))
 		N_MSG(RSP, "[IO] Error");
 	if (flags & (1 << 2))