ttroff: avoid crash if home == NULL - plan9port - [fork] Plan 9 from user space
  HTML git clone git://src.adamsgaard.dk/plan9port
   DIR Log
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       ---
   DIR commit 6530d37d7f3f6d00527a71ba8a02c536c28b5d9f
   DIR parent 7351eea28ed2d396ca524bb0164501aaca857e8f
  HTML Author: Russ Cox <rsc@swtch.com>
       Date:   Sun, 27 Dec 2009 09:22:43 -0800
       
       ttroff: avoid crash if home == NULL
       
       R=rsc
       http://codereview.appspot.com/181070
       
       Diffstat:
         M src/cmd/troff/dwbinit.c             |       3 ++-
       
       1 file changed, 2 insertions(+), 1 deletion(-)
       ---
   DIR diff --git a/src/cmd/troff/dwbinit.c b/src/cmd/troff/dwbinit.c
       t@@ -189,7 +189,8 @@ char *DWBhome(void)
                    if ( (home = DWBHOME) == NULL || *home == '\0' || *home == ' ' )
                        home = NULL;
                }   /* End if */
       -        home = unsharp(home);
       +        if ( home != NULL )
       +            home = unsharp(home);
            }        /* End if */
        
            while (home && *home == '/' && *(home +1) == '/')        /* remove extra slashes */