Include <sys/mutex.h>'s prerequisite <sys/lock.h> instead of depending on

namespace pollution in <sys/vnode.h>.

Sort the include of <sys/mutex.h> instead of unsorting it after
<sys/vnode.h> and depending on the pollution there.

Approved by:	re (kensmith) (blanket)

sys/fs/msdosfs/msdosfs_vfsops.c

@@ -51,6 +51,8 @@
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/conf.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
 #include <sys/namei.h>
 #include <sys/priv.h>
 #include <sys/proc.h>
@@ -61,7 +63,6 @@
 #include <sys/malloc.h>
 #include <sys/stat.h> 				/* defines ALLPERMS */
 #include <sys/iconv.h>
-#include <sys/mutex.h>
 
 #include <fs/msdosfs/bpb.h>
 #include <fs/msdosfs/bootsect.h>