From: Sam Ravnborg <sam@ravnborg.org>

modpost or to be more specific sumversion.c was not behaving correct when
used with O= and MODULE_VERSION was used.  Previously it failed to use
local .h when calculation the md-sum in case of a O= build.

The following patch introduces the following:

- A generic get_next_line()

- Check that the topmost part of the directory matches

- Using strrch when checking for file with suffix .o

- Use NOFAIL for allocations in sumversion

- Avoid memory leak in new_module

The generic get_next_line will pay off when Andreas implmentation of
storing symbol addresses in a seperate file is introduced.