Changeset 64908df in rtems for cpukit/libfs/src

Fixes bitmap allocation accounting logic in rtems-rfs-bitmaps.c

The bitmap allocation accounting logic in rtems-rfs-bitmaps.c is flawed
around control->free. Specifically:

In rtems_rfs_bitmap_map_set():
control->free is only decremented when its corresponding search bit is
toggled. This is wrong and will miss on average 31/32 set updates.

In rtems_rfs_bitmap_map_clear():
control->free is incremented unconditionally.

The correct behavior is:
When updating the map, check if the bit is already set/clear. Only update
control->free when the bit is toggled.

This change enforced the correct behavior.

Tested by inspecting the internal data structure.