strutils.strnlen returns actulal length + 1

[lzsiga]

Hi, I'd like to suggest the following fix:

--- strutils.bak.c      2017-02-22 11:16:55.000000000 +0100
+++ strutils.c  2018-05-27 20:38:25.000000000 +0200
@@ -241,7 +241,7 @@
  
          for (i = 0; i < maxlen; i++) {
                  if (s[i] == '\0')
-                         return i + 1;
+                         return i;
          }
          return maxlen;
  }

[karelzak]

Oh, bug from year 2009... Thanks!