SERIAL: ioc3_serial: Return -ENOMEM on memory allocation failure

In this code, 0 is returned on memory allocation failure, even though other
failures return -ENOMEM or other similar values.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression ret;
expression x,e1,e2,e3;
@@

ret = 0
... when != ret = e1
*x = \(kmalloc\|kcalloc\|kzalloc\)(...)
... when != ret = e2
if (x == NULL) { ... when != ret = e3
return ret;
}
// </smpl>

Signed-off-by: Julia Lawall <[e-mail]>
To: Pat Gefre <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Patchwork: https://patchwork.linux-mips.org/patch/1704/
Signed-off-by: Ralf Baechle <[e-mail]>

drivers/serial/ioc3_serial.c

···
 		if (!port) {
 			printk(KERN_WARNING
 			       "IOC3 serial memory not available for port\n");
+			ret = -ENOMEM;
 			goto out4;
 		}
 		spin_lock_init(&port->ip_lock);