bt: Fix bracket warning

Merges https://github.com/espressif/esp-idf/pull/2568

components/bt/bluedroid/stack/gatt/gatt_utils.c

@@ -2192,9 +2192,10 @@ void gatt_end_operation(tGATT_CLCB *p_clcb, tGATT_STATUS status, void *p_data)
         (*p_disc_cmpl_cb)(conn_id, disc_type, status);
     } else if (p_cmpl_cb && op) {
         (*p_cmpl_cb)(conn_id, op, status, &cb_data);
-    } else
+    } else {
         GATT_TRACE_WARNING ("gatt_end_operation not sent out op=%d p_disc_cmpl_cb:%p p_cmpl_cb:%p",
                             operation, p_disc_cmpl_cb, p_cmpl_cb);
+    }
 }
 
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