[Android] Fix segfault when calling GetMemoryInfo

[peak3d]

Description

Trying to open PlayerInfo OSD currently lead to crash on android devices.

Motivation and Context

Fix segfault

How Has This Been Tested?

Run video, press o

Types of change

• Bug fix (non-breaking change which fixes an issue)
• Clean up (non-breaking change which removes non-working, unmaintained functionality)
• Improvement (non-breaking change which improves existing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that will cause existing functionality to change)
• Cosmetic change (non-breaking change that doesn't touch code)
• None of the above (please explain below)

[fritsch]

This is broken on all other platforms as well.

[peak3d]

Let me change the PR for the other platforms, too.
Edit: @fritsch I can only find this issue in android impl.:
https://github.com/xbmc/xbmc/blob/master/xbmc/platform/android/MemUtils.cpp#L42