sparc64: vcc: Fix error return code in vcc_probe()

Fix to return negative error code -ENOMEM from the error handling
case instead of 0, as done elsewhere in this function.

Signed-off-by: Wei Yongjun <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/tty/vcc.c

···
 	port->index = vcc_table_add(port);
 	if (port->index == -1) {
 		pr_err("VCC: no more TTY indices left for allocation\n");
+		rv = -ENOMEM;
 		goto free_ldc;
 	}