umount.nfs: make del_mtab() a static function

Clean-up: del_mtab() isn't used outside of nfsumount.c.

---

 utils/mount/nfsumount.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

index 2d68e7e..db22c11 100644
@@ -53,7 +53,7 @@ int force;
 int lazy;
 int remount;
 
-int del_mtab(const char *spec, const char *node)
+static int del_mtab(const char *spec, const char *node)
 {
 	int umnt_err, res;
 

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