fix(nimble): fix memory leak issue in Blufi example

nimble/host/include/host/ble_gatt.h

@@ -1250,7 +1250,7 @@ STAILQ_HEAD(ble_gatts_clt_cfg_list, ble_gatts_clt_cfg);
  *                              BLE_HS_ENOMEM on heap exhaustion.
  */
 int ble_gatts_add_svcs(const struct ble_gatt_svc_def *svcs);
-
+void ble_gatts_free_svcs(void);
 #if MYNEWT_VAL(BLE_DYNAMIC_SERVICE)
 /**
  * Adds a set of services for registration.  All services added

nimble/host/services/gap/include/services/gap/ble_svc_gap.h

@@ -58,6 +58,7 @@ int ble_svc_gap_device_key_material_set(uint8_t *session_key, uint8_t *iv);
 #endif
 
 void ble_svc_gap_init(void);
+void ble_svc_gap_deinit(void);
 
 #ifdef __cplusplus
 }

nimble/host/services/gap/src/ble_svc_gap.c

@@ -370,3 +370,9 @@ ble_svc_gap_init(void)
     SYSINIT_PANIC_ASSERT(rc == 0);
 #endif
 }
+
+void
+ble_svc_gap_deinit(void)
+{
+    ble_gatts_free_svcs();
+}

nimble/host/services/gatt/include/services/gatt/ble_svc_gatt.h

@@ -51,7 +51,7 @@ uint8_t ble_svc_gatt_get_csfs(void);
 uint8_t ble_svc_gatt_get_local_cl_supported_feat(void);
 void ble_svc_gatt_changed(uint16_t start_handle, uint16_t end_handle);
 void ble_svc_gatt_init(void);
-
+void ble_svc_gatt_deinit(void);
 #ifdef __cplusplus
 }
 #endif

nimble/host/services/gatt/src/ble_svc_gatt.c

@@ -249,3 +249,9 @@ ble_svc_gatt_init(void)
         ble_svc_gatt_local_cl_sup_feat |= (1 << BLE_SVC_GATT_CLI_SUP_FEAT_ROBUST_CATCHING_BIT);
     }
 }
+
+void
+ble_svc_gatt_deinit(void)
+{
+    ble_gatts_free_svcs();
+}

nimble/host/src/ble_gatts.c

@@ -3032,6 +3032,19 @@ done:
     return rc;
 }
 
+void ble_gatts_free_svcs(void)
+{
+    /* Ensure the memory is freed only if it was previously allocated */
+    if (ble_gatts_svc_defs != NULL) {
+        /* Free the memory for the service definitions */
+        free(ble_gatts_svc_defs);
+        /* Set the pointer to NULL to avoid dangling pointer */
+        ble_gatts_svc_defs = NULL;
+        /* Reset the number of service definitions to 0 */
+        ble_gatts_num_svc_defs = 0;
+    }
+}
+
 int
 ble_gatts_svc_set_visibility(uint16_t handle, int visible)
 {