Simplify mu_file_safety_check call.

* include/mailutils/util.h (mu_file_safety_check): Change type
of the 3rd argument to uid_t.
* libmailutils/base/filesafety.c: Likewise.  All uses updated.

@@ -220,10 +220,8 @@ int mu_onexit (mu_onexit_t func, void *data);
   MU_FILE_SAFETY_DIR_IWOTH      )
   
 
-struct mu_auth_data;
-
 int mu_file_safety_check (const char *filename, int mode,
-			  struct mu_auth_data *auth,
+			  uid_t uid,
 			  mu_list_t idlist);
 int mu_file_safety_name_to_code (const char *name, int *pcode);
 int mu_file_safety_name_to_error (const char *name, int *pcode);  

@@ -191,7 +191,7 @@ mu_file_safety_name_to_error (const char *name, int *pcode)
 
 int
 mu_file_safety_check (const char *filename, int mode,
-		      struct mu_auth_data *auth,
+		      uid_t uid,
 		      mu_list_t idlist)
 {
   struct file_check_buffer buf;
@@ -209,9 +209,7 @@ mu_file_safety_check (const char *filename, int mode,
 	    return MU_ERR_EXISTS;
 	}
 
-      if ((mode & MU_FILE_SAFETY_OWNER_MISMATCH) &&
-	  auth &&
-	  auth->uid != buf.filst.st_uid)
+      if ((mode & MU_FILE_SAFETY_OWNER_MISMATCH) && uid != buf.filst.st_uid)
 	return MU_ERR_PERM_OWNER_MISMATCH;
 
       for (pck = file_safety_check_tab; pck->flag; pck++)

@@ -74,7 +74,7 @@ mu_check_tls_environment (void)
     {
       int rc = mu_file_safety_check (mu_tls_module_config.ssl_cert,
 				     mu_tls_module_config.ssl_cert_safety_checks,
-				     NULL, NULL);
+				     -1, NULL);
       if (rc)
 	{
 	  mu_error ("%s: %s", mu_tls_module_config.ssl_cert, 
@@ -83,7 +83,7 @@ mu_check_tls_environment (void)
 	}
       rc = mu_file_safety_check (mu_tls_module_config.ssl_key,
 				 mu_tls_module_config.ssl_key_safety_checks,
-				 NULL, NULL);
+				 -1, NULL);
       if (rc)
 	{
 	  mu_error ("%s: %s", mu_tls_module_config.ssl_key, 
@@ -93,7 +93,7 @@ mu_check_tls_environment (void)
 
       rc = mu_file_safety_check (mu_tls_module_config.ssl_cafile,
 				 mu_tls_module_config.ssl_cafile_safety_checks,
-				 NULL, NULL);
+				 -1, NULL);
       if (rc)
 	{
 	  mu_error ("%s: %s", mu_tls_module_config.ssl_cafile, 

@@ -213,7 +213,7 @@ maidag_forward (mu_message_t msg, struct mu_auth_data *auth, char *fwfile)
     mu_list_create (&idlist);
 
   rc = mu_file_safety_check (filename, forward_file_checks,
-			     auth, idlist);
+			     auth->uid, idlist);
   if (rc == 0)
     result = process_forward (msg, filename, auth->name);
   else if (rc == MU_ERR_EXISTS)