fix logic in strtok_ws

bug reported by Ellington Santos on the mailing-list, thanks!

1 files changed, 1 insertions, 1 deletions

diff --git a/src/main.c b/src/main.c
index de2a793..3855bac 100644
--- a/src/main.c
+++ b/src/main.c
@@ -171,7 +171,7 @@ strtok_ws (char *s)
   char *nonws;
   static char *last = NULL;
 
-  if (s == NULL)
+  if (s != NULL)
     last = s;
   else if (last == NULL)
     {