powerpc/pseries/dlpar: Use kasprintf

kasprintf combines kmalloc and sprintf, and takes care of the size
calculation itself.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression a,flag;
expression list args;
statement S;
@@

  a =
-  \(kmalloc\|kzalloc\)(...,flag)
+  kasprintf(flag,args)
  <... when != a
  if (a == NULL || ...) S
  ...>
- sprintf(a,args);
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Acked-by: Nathan Fontenot <nfont@austin.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/platforms/pseries/dlpar.c

@@ -79,13 +79,12 @@ static struct device_node *dlpar_parse_cc_node(struct cc_workarea *ccwa)
 	 * prepend this to the full_name.
 	 */
 	name = (char *)ccwa + ccwa->name_offset;
-	dn->full_name = kmalloc(strlen(name) + 2, GFP_KERNEL);
+	dn->full_name = kasprintf(GFP_KERNEL, "/%s", name);
 	if (!dn->full_name) {
 		kfree(dn);
 		return NULL;
 	}
 
-	sprintf(dn->full_name, "/%s", name);
 	return dn;
 }
 
@@ -410,15 +409,13 @@ static ssize_t dlpar_cpu_probe(const char *buf, size_t count)
 	 * directory of the device tree.  CPUs actually live in the
 	 * cpus directory so we need to fixup the full_name.
 	 */
-	cpu_name = kzalloc(strlen(dn->full_name) + strlen("/cpus") + 1,
-			   GFP_KERNEL);
+	cpu_name = kasprintf(GFP_KERNEL, "/cpus%s", dn->full_name);
 	if (!cpu_name) {
 		dlpar_free_cc_nodes(dn);
 		rc = -ENOMEM;
 		goto out;
 	}
 
-	sprintf(cpu_name, "/cpus%s", dn->full_name);
 	kfree(dn->full_name);
 	dn->full_name = cpu_name;