[OpenSIPS-Devel] [OpenSIPS/opensips] 469e2b: fix str2int and str2sint input params check

[ionutrazvanionita]

  Branch: refs/heads/1.11
  Home:   https://github.com/OpenSIPS/opensips
  Commit: 469e2bf781b11e8607421765b8a2b490829097da
      https://github.com/OpenSIPS/opensips/commit/469e2bf781b11e8607421765b8a2b490829097da
  Author: ionutrazvanionita <ionutionita at opensips.org>
  Date:   2015-11-13 (Fri, 13 Nov 2015)

  Changed paths:
    M ut.h

  Log Message:
  -----------
  fix str2int and str2sint input params check

* if a void string was given to the function ("") 0 value was returned which was not correct
* input values should be checked for NULL