nimble/host: Check if HCI command buffer was allocated

BLE_HS_DBG_ASSERT is not enabled by default, and that code is
already handling error path.

Author: sjanc

nimble/host/src/ble_hs_hci_cmd.c

@@ -51,6 +51,9 @@ ble_hs_hci_cmd_send(uint16_t opcode, uint8_t len, const void *cmddata)
 
     cmd = ble_transport_alloc_cmd();
     BLE_HS_DBG_ASSERT(cmd != NULL);
+    if (cmd == NULL) {
+        return BLE_HS_ENOMEM;
+    }
 
     cmd->opcode = htole16(opcode);
     cmd->length = len;