Dircache: Improve freed name memory recallocation

There's only a need to check every MAX_TINYNAME+1 bytes and that the
last character of the needed size 0xff in order to verify the size
of the block since the minimum indirectly-stored string is
MAX_TINYNAME+1.

Change-Id: Ic789376b8575bab9266fcd54c610db0961de5d7f
1 file changed