remove heap overflow ion tfree(path)

ChangeLog

@@ -3,6 +3,7 @@
    (755 instead of 644)
  *  fteext.h spiceif.c options.c dotcards.c: .options NOACCT added
  * /tests/.../*.cir  .options noacct added (except BSIM3 files)
+ * main.c:614 allow null terminator in string
 
 2009-02-22 Dietmar Warning
  * devices/adms/mextram: Update to release version 504.7 now with selfheating

src/main.c

@@ -611,7 +611,7 @@ read_initialisation_file(char * dir, char * name)
 	asprintf(&path, "%s" DIR_PATHSEP "%s", dir,name);
 	if(path==NULL) return FALSE;	/* memory allocation error */
 #else /* ~ HAVE_ASPRINTF */
-	path=(char*)tmalloc(1 + strlen(dir)+strlen(name));
+	path=(char*)tmalloc(2 + strlen(dir)+strlen(name));
 	if(path==NULL) return FALSE;	/* memory allocation error */
 	sprintf(path,"%s" DIR_PATHSEP "%s",dir,name);
 #endif /* HAVE_ASPRINTF */