patch 9.0.1864: still crash with bt_quickfix1_poc

Problem:  crash with bt_quickfix1_poc when cleaning up
          and EXITFREE is defined
Solution: Test if buffer is valid in a window, else close
          window directly, don't try to access buffer properties

While at it, increase the crash timeout slightly, so that CI has a
chance to finish processing the test_crash() test.

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_crash.vim b/src/testdir/test_crash.vim
index b997cc1..8c79d3a 100644
--- a/src/testdir/test_crash.vim
+++ b/src/testdir/test_crash.vim
@@ -40,7 +40,7 @@
   " clean up
   call delete('Xerr')
   " This test takes a bit longer
-  call TermWait(buf, 500)
+  call TermWait(buf, 1000)
 
   let file = 'crash/poc_tagfunc.vim'
   let args = printf(cmn_args, vim, file)
@@ -55,7 +55,7 @@
     \ '  && echo "crash 6: [OK]" >> X_crash1_result.txt' .. "\<cr>")
   " clean up
   call delete('X')
-  call TermWait(buf, 200)
+  call TermWait(buf, 1000)
 
   " clean up
   exe buf .. "bw!"