cmd: mii: don't check address for 'device' subcommand

All mii operations require a valid PHY address except the 'device'
command, which expects the PHY name rather than the address.

Signed-off-by: Hector Palacios <hector.palacios@digi.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

cmd/mii.c

@@ -313,7 +313,7 @@ static int do_mii(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 			mask = simple_strtoul(argv[5], NULL, 16);
 	}
 
-	if (addrhi > 31) {
+	if (addrhi > 31 && strncmp(op, "de", 2)) {
 		printf("Incorrect PHY address. Range should be 0-31\n");
 		return CMD_RET_USAGE;
 	}