reiserfs: rework reiserfs_panic

ReiserFS panics can be somewhat inconsistent.
In some cases:
 * a unique identifier may be associated with it
 * the function name may be included
 * the device may be printed separately

This patch aims to make warnings more consistent. reiserfs_warning() prints
the device name, so printing it a second time is not required. The function
name for a warning is always helpful in debugging, so it is now automatically
inserted into the output. Hans has stated that every warning should have
a unique identifier. Some cases lack them, others really shouldn't have them.
reiserfs_warning() now expects an id associated with each message. In the
rare case where one isn't needed, "" will suffice.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/reiserfs/objectid.c b/fs/reiserfs/objectid.c
index a3a5f43..90e4e52 100644
--- a/fs/reiserfs/objectid.c
+++ b/fs/reiserfs/objectid.c
@@ -18,8 +18,7 @@
 static void check_objectid_map(struct super_block *s, __le32 * map)
 {
 	if (le32_to_cpu(map[0]) != 1)
-		reiserfs_panic(s,
-			       "vs-15010: check_objectid_map: map corrupted: %lx",
+		reiserfs_panic(s, "vs-15010", "map corrupted: %lx",
 			       (long unsigned int)le32_to_cpu(map[0]));
 
 	// FIXME: add something else here