Replace g_free() by mhl_mem_free()

[metux]

Now as we have mhl in mainline, replace g_free() by mhl_mem_free()

branch:227_replace_g_free
changeset:15d7d47c1556c154a0cf93ef887a3d0b9d962511

committed master
changeset:8b38cf44daee3b0f92591baa97f36d722be99280

[slyfox]

git log --stat -p master..origin/227_replace_g_free does not fit into 1 page:

73 files changed, 1146 insertions(+), 1054 deletions(-)

But patch looks trivial (and shows what a mess we have in respect to memory allocation in general).

With that it will be easier to switch alloc/free implementation for the whole project.

Voted.

[winnie]

looks fine