lib/drmtest: don't complete fixtures with a longjmp

Longjmp creates havoc with stack variables of the current stackframe.
And since fixtures should be used to set up such variables creating
havoc isn't a great idea. With this I can revert a bunch of
bogus patches I've done to paper over this by moving stack variables
to be global.

The same issue is actually a feature for subtest blocks since subtests
should be independant anyway.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

lib/drmtest.c

@@ -666,6 +666,11 @@ bool __igt_fixture(void)
 	return true;
 }
 
+void __igt_fixture_complete(void)
+{
+	in_fixture = false;
+}
+
 void __igt_fixture_end(void)
 {
 	assert(in_fixture);