libfshelp: Fix record lock when len=0

When len=0 and start is completely before an existing lock, there is no
interference.

* libfshelp/rlock-tweak.c (fshelp_rlock_tweak): Fix test when len=0.

1 files changed, 2 insertions, 4 deletions

diff --git a/libfshelp/rlock-tweak.c b/libfshelp/rlock-tweak.c
index 8edc53b94..b0f4b9f5f 100644
--- a/libfshelp/rlock-tweak.c
+++ b/libfshelp/rlock-tweak.c
@@ -312,10 +312,8 @@ fshelp_rlock_tweak (struct rlock_box *box, pthread_mutex_t *mutex,
 	          return 0;
 		}
 	    }
-	  else if (l->start < start
-		   && (len == 0
-		       || (start <= l->start + l->len
-			   && start + len > l->start + l->len)))
+	  else if (l->start < start && start <= l->start + l->len
+		   && (len == 0 || start + len > l->start + l->len))
 	    /* Our start falls within the locked region or exactly one
 	       byte after it and our end falls beyond it.  We know that
 	       we cannot consume the entire region.  */