Patch 8.0.1622
Problem:    Possible NULL pointer dereferencey. (Coverity)
Solution:   Reverse the check for a NULL pointer.
Files:      src/quickfix.c


*** ../vim-8.0.1621/src/quickfix.c      2018-03-06 17:43:18.589288912 +0100
--- src/quickfix.c      2018-03-20 13:28:50.509827097 +0100
***************
*** 4256,4262 ****
        goto theend;
      }
  
!     if (s != NULL && *s == NUL)
      {
        /* Pattern is empty, use last search pattern. */
        if (last_search_pat() == NULL)
--- 4256,4262 ----
        goto theend;
      }
  
!     if (s == NULL || *s == NUL)
      {
        /* Pattern is empty, use last search pattern. */
        if (last_search_pat() == NULL)
*** ../vim-8.0.1621/src/version.c       2018-03-20 13:00:07.194308797 +0100
--- src/version.c       2018-03-20 13:29:55.309493509 +0100
***************
*** 768,769 ****
--- 768,771 ----
  {   /* Add new patch number below this line */
+ /**/
+     1622,
  /**/

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