* lisp/emacs-lisp/ert.el (ert-test--erts-test): Fix 'Skip' behavior in
erts files, so only the test case where it is specified is skipped.

The following reproducer might be useful to test the patch.

erts-repro-tests.el:

	(require 'ert)
	(require 'ert-x)
	
	(ert-deftest erts-skip-test ()
	  "Skip erts test case."
	  (ert-test-erts-file (ert-resource-file "erts-skip.erts")
	                      (lambda () ())))

resources/erts-skip.erts:

	Name: first
	Skip: t
	
	=-=
	XXX
	=-=
	XXX
	=-=-=
	
	Name: second
	
	=-=
	XXX
	=-=
	YYY
	=-=-=
	
	Name: third
	
	=-=
	XXX
	=-=
	YYY
	=-=-=

Before the fix, the test case named "second" is also skipped.  Although,
third is run.  Also, if the last test case of an erts file is skipped,
the following error is reported:

	F erts-skip-test
	    Skip erts test case.
	    (search-failed "^=-=-=\n")

This my first contribution to GNU Emacs and I have not signed the
Copyright Assignment paperwork.  However, given that it is a one-line
patch, I think it is fine to add:

        Copyright-paperwork-exempt: yes

Regards,

        Roi