JFS: fix sparse warnings by moving extern declarations to headers

Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
diff --git a/fs/jfs/jfs_logmgr.c b/fs/jfs/jfs_logmgr.c
index dfa1200..c5cc03b 100644
--- a/fs/jfs/jfs_logmgr.c
+++ b/fs/jfs/jfs_logmgr.c
@@ -71,6 +71,7 @@
 #include "jfs_incore.h"
 #include "jfs_filsys.h"
 #include "jfs_metapage.h"
+#include "jfs_superblock.h"
 #include "jfs_txnmgr.h"
 #include "jfs_debug.h"
 
@@ -167,14 +168,6 @@
 static DECLARE_MUTEX(jfs_log_sem);
 
 /*
- * external references
- */
-extern void txLazyUnlock(struct tblock * tblk);
-extern int jfs_stop_threads;
-extern struct completion jfsIOwait;
-extern int jfs_tlocks_low;
-
-/*
  * forward references
  */
 static int lmWriteRecord(struct jfs_log * log, struct tblock * tblk,