now stat skips md5 if file isn't readable

files/stat

@@ -132,9 +132,10 @@ def main():
     if S_ISLNK(mode):
         d['lnk_source'] = os.path.realpath(path)
 
-    if S_ISREG(mode) and get_md5:
+    if S_ISREG(mode) and get_md5 and os.access(path,os.R_OK):
         d['md5']       = module.md5(path)
 
+
     try:
         pw = pwd.getpwuid(st.st_uid)