drivers/cpufreq/pcc-cpufreq.c: fix error return code

Convert a 0 error return code to a negative one, as returned elsewhere in the
function.

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

// <smpl>
@@
identifier ret;
expression e,e1,e2,e3,e4,x;
@@

(
if (\(ret != 0\|ret < 0\) || ...) { ... return ...; }
|
ret = 0
)
... when != ret = e1
*x = \(kmalloc\|kzalloc\|kcalloc\|devm_kzalloc\|ioremap\|ioremap_nocache\|devm_ioremap\|devm_ioremap_nocache\)(...);
... when != x = e2
    when != ret = e3
*if (x == NULL || ...)
{
  ... when != ret = e4
*  return ret;
}
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

drivers/cpufreq/pcc-cpufreq.c

@@ -454,6 +454,7 @@ static int __init pcc_cpufreq_probe(void)
 					mem_resource->address_length);
 	if (pcch_virt_addr == NULL) {
 		pr_debug("probe: could not map shared mem region\n");
+		ret = -ENOMEM;
 		goto out_free;
 	}
 	pcch_hdr = pcch_virt_addr;