xfs: don't expect xfs headers to be in subdirectories

Fix up some #include directives in preparation for moving a few
header files out of xfs source subdirectories.

Note that "xfs_linux.h" also got its quoting convention for included
files switched.

Signed-off-by: Alex Elder <aelder@sgi.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

fs/xfs/xfs.h

@@ -24,5 +24,6 @@
 #define XFS_BUF_LOCK_TRACKING 1
 #endif
 
-#include <linux-2.6/xfs_linux.h>
+#include "xfs_linux.h"
+
 #endif	/* __XFS_H__ */