Ensure return string is empty before using strcat to construct it.

From-SVN: r59422

libiberty/ChangeLog

@@ -1,3 +1,8 @@
+2002-11-24  Nick Clifton  <nickc@redhat.com>
+
+	* make-relative-prefix.c (make_relative_prefix): Ensure return
+	string is empty before using strcat to construct it.
+
 2002-11-22  Daniel Jacobowitz  <drow@mvista.com>
 
 	* Makefile.in: Add make-relative-prefix.c.

libiberty/make-relative-prefix.c

@@ -362,6 +362,7 @@ make_relative_prefix (progname, bin_prefix, prefix)
     return NULL;
 
   /* Build up the pathnames in argv[0].  */
+  *ret = '\0';
   for (i = 0; i < prog_num; i++)
     strcat (ret, prog_dirs[i]);