fs/cramfs: use pr_fmt

Use module name for "cramfs: " prefix.  (note that uncompress.c printk had
no prefix).

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/cramfs/uncompress.c b/fs/cramfs/uncompress.c
index 76428cc..b7f030b 100644
--- a/fs/cramfs/uncompress.c
+++ b/fs/cramfs/uncompress.c
@@ -15,6 +15,8 @@
  * then is used by multiple filesystems.
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/vmalloc.h>