[XFS] mutex fallout - fix debug builds and remove no-longer-useful comment.

Signed-off-by: Nathan Scott <[e-mail]>

fs/xfs/linux-2.6/mutex.h

···
 #ifndef __XFS_SUPPORT_MUTEX_H__
 #define __XFS_SUPPORT_MUTEX_H__
 
-#include <linux/spinlock.h>
 #include <linux/mutex.h>
 
-/*
- * Map the mutex'es from IRIX to Linux semaphores.
- *
- * Destroy just simply initializes to -99 which should block all other
- * callers.
- */
-#define MUTEX_DEFAULT		0x0
-
-typedef struct mutex		mutex_t;
-//#define mutex_destroy(lock)			do{}while(0)
+typedef struct mutex mutex_t;
 
 #endif /* __XFS_SUPPORT_MUTEX_H__ */

fs/xfs/quota/xfs_qm.c

···
 	xqm->qm_dqfree_ratio = XFS_QM_DQFREE_RATIO;
 	xqm->qm_nrefs = 0;
 #ifdef DEBUG
-	xfs_mutex_init(&qcheck_lock, MUTEX_DEFAULT, "qchk");
+	mutex_init(&qcheck_lock);
 #endif
 	return xqm;
 }