lib: fix SA warning in skiplist code

Clang was thinking the random level could be negative.  (And, no, I
couldn't figure that out by reading its output... trial and error this
was.)

Signed-off-by: David Lamparter <equinox@diac24.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/skiplist.c b/lib/skiplist.c
index a36bf47139..585cf859e5 100644
--- a/lib/skiplist.c
+++ b/lib/skiplist.c
@@ -202,6 +202,7 @@ int skiplist_insert(register struct skiplist *l, register void *key,
 	}
 
 	k = randomLevel();
+	assert(k >= 0);
 	if (k > l->level) {
 		k = ++l->level;
 		update[k] = l->header;