Move the test for no segments before the assertion for non-NULL segment

Move the test for no segments before the assertion for non-NULL segment

2000-02-14  Tor Lillqvist  <tml@iki.fi>

* gdk/gdkdraw.c (gdk_draw_segments): Move the test for no segments
before the assertion for non-NULL segment list.

* gdk/win32/gdkgc-win32.c: (gdk_win32_gc_values_to_win32values):
Seems that pattern brushes *must* be 8x8 pixels! At least on my
machine, but it might be display driver dependent. Sigh, so make
sure the stipple is that size. Does Windows suck or what?

* gdk/win32/gdkdrawable-win32.c: Improve error handling in a few
places.