troff: avoid crash if home == NULL

R=rsc http://codereview.appspot.com/181070
2009-12-27 09:22:43 -08:00 · 2009-12-27 09:22:43 -08:00 · 6530d37d7f
commit 6530d37d7f
parent 7351eea28e
1 changed files with 2 additions and 1 deletions
--- a/src/cmd/troff/dwbinit.c
+++ b/src/cmd/troff/dwbinit.c
@ -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 */