microblaze: Fix coding style issues

Fix coding style issues reported by checkpatch.pl.

Signed-off-by: Michal Simek <monstr@monstr.eu>
diff --git a/arch/microblaze/kernel/module.c b/arch/microblaze/kernel/module.c
index f39257a..f0f4368 100644
--- a/arch/microblaze/kernel/module.c
+++ b/arch/microblaze/kernel/module.c
@@ -108,8 +108,7 @@
 			break;
 
 		default:
-			printk(KERN_ERR "module %s: "
-				"Unknown relocation: %u\n",
+			pr_err("module %s: Unknown relocation: %u\n",
 				module->name,
 				ELF32_R_TYPE(rela[i].r_info));
 			return -ENOEXEC;