[system][bt] fix -Wdangling-gsl

am: 20ed45d633

Change-Id: I9f59103dc40ae2154a2b2314d309ba0f7184376a

diff --git a/service/low_energy_client.cc b/service/low_energy_client.cc
index b8f5e98..ed1cf46 100644 (file)
--- a/service/low_energy_client.cc
+++ b/service/low_energy_client.cc
@@ -189,8 +189,8 @@ void LowEnergyClient::MtuChangedCallback(
 
   if (!bda) return;
 
-  const char* addr = BtAddrString(bda).c_str();
-  if (delegate_) delegate_->OnMtuChanged(this, status, addr, mtu);
+  std::string addr = BtAddrString(bda);
+  if (delegate_) delegate_->OnMtuChanged(this, status, addr.c_str(), mtu);
 }
 
 // LowEnergyClientFactory implementation