Fix -Wmisleading indentation false-positive for do-while statement

Fix -Wmisleading indentation false-positive for do-while statement

gcc/c-family/ChangeLog:

	PR c++/69029
	* c-indentation.c (should_warn_for_misleading_indentation):
	Don't warn about do-while statements.

gcc/testsuite/ChangeLog:

	PR c++/69029
	* c-c++-common/Wisleading-indentation.c: Augment test.

From-SVN: r232202