xen: Convert printks to pr_<level>

Convert printks to pr_<level> (excludes printk(KERN_DEBUG...)
to be more consistent throughout the xen subsystem.

Add pr_fmt with KBUILD_MODNAME or "xen:" KBUILD_MODNAME
Coalesce formats and add missing word spaces
Add missing newlines
Align arguments and reflow to 80 columns
Remove DRV_NAME from formats as pr_fmt adds the same content

This does change some of the prefixes of these messages
but it also does make them more consistent.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
diff --git a/drivers/xen/xenfs/super.c b/drivers/xen/xenfs/super.c
index 7167987..06092e0 100644
--- a/drivers/xen/xenfs/super.c
+++ b/drivers/xen/xenfs/super.c
@@ -7,6 +7,8 @@
  *                              Turned xenfs into a loadable module.
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/module.h>
@@ -82,7 +84,7 @@
 	if (xen_domain())
 		return register_filesystem(&xenfs_type);
 
-	printk(KERN_INFO "XENFS: not registering filesystem on non-xen platform\n");
+	pr_info("not registering filesystem on non-xen platform\n");
 	return 0;
 }