Pass the correct pointer to munmap on failure.

This won't ever happen, and you're probably screwed anyway if it
does, but that's no excuse...

Change-Id: Ic7e91285996f9f52d898326757c6fc53fcac34c9
Merge "Pass the correct pointer to munmap on failure." into cm-10.1
Merge remote branch 'cm/cm-10.1' into jb