ArmPkg/BdsLib: Fixed ShutdownUefiBootServices() in case the first gBS->GetMemoryMap...

ArmPkg/BdsLib: Fixed ShutdownUefiBootServices() in case the first gBS->GetMemoryMap() was successful

If the first call of gBS->GetMemoryMap() succeeded (could happen if the Memory Map
has changed between the two gBS->GetMemoryMap() calls) in the loop block then
gBS->ExitBootServices() was never called.

Signed-off-by: Eugene Cohen <eugene@hp.com>
Reviewed-by: Olivier Martin <olivier.martin@arm.com>
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13500 6f19259b-4bc3-4df7-8a09-765794883524