* lib/gdb.exp (gdb_test_sequence): Return result of gdb_expect_list.

	* lib/gdb.exp (gdb_test_sequence): Return result of gdb_expect_list.
	(gdb_expect_list): Fix spelling errors in comments.
	* gdb.arch/system-gcore.exp: Use gdb_test_sequence instead of
	send_gdb/gdb_expect_list where applicable.
	* gdb.base/call-ar-st.exp: Ditto.
	* gdb.base/funcargs.exp: Ditto.
	* gdb.base/gcore.exp: Ditto.
	* gdb.base/page.exp: Ditto.
	* gdb.base/sigaltstack.exp: Ditto.
	* gdb.base/siginfo.exp: Ditto.
	* gdb.base/sigstep.exp: Ditto.
	* gdb.base/trace-commands.exp: Ditto.