Report the line number where the test failed to wait for the child so
one can identify which child process did not behave as expected.
Also wait_child_process() is meant for the general case so report
all non-crash error cases as test failures so they are accounted for.
Omit the "winetest_" prefix to match the other Wine test functions and
so the underlying winetest_wait_child_process() function can be wrapped
with the usual line-capturing macros.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=48651Signed-off-by: Francois Gouget <fgouget@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>