Move (sometimes duplicate) the required bits into new shared files
tools-common.(c|h) that are compiled into the internal tools library. Rename the
test_foo() functions to tools_foo() and in one case just copy the code of the
keymap compile function to the tool.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Passing -errno around and having separate labels depending on failure types is
superfluous here. All the unref calls can handle NULL and nothing cares about
errno once we're out of the immediate scope. So let's simplify this and deal
with 0 and 1 only.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>