Fixed indentation.

Some lines (incorrectly) had an indentation of 3 or 5, or 7 or 9,
or 11 or 13, or 15 or 17 spaces instead of 4, 8, 12, or 16.  Fix them.

Found with:

$ find src -type f | xargs grep -n '^   [^ ]';
$ find src -type f | xargs grep -n '^     [^ *]';
$ find src -type f | xargs grep -n '^       [^ ]';
$ find src -type f | xargs grep -n '^         [^ *]';
$ find src -type f | xargs grep -n '^           [^ +]';
$ find src -type f | xargs grep -n '^             [^ *+]';
$ find src -type f | xargs grep -n '^               [^ +]';
$ find src -type f | xargs grep -n '^                 [^ *+]';

src/nxt_clone.c

@@ -384,7 +384,7 @@ nxt_clone_vldt_credential_gidmap(nxt_task_t *task,
         }
 
         return NXT_OK;
-   }
+    }
 
     base_ok = 0;
     gids_ok = 0;