* gcc.dg/debug/dwarf2-1.c: Update for return warnings.
	* gcc.dg/noncompile/920507-1.c, gcc.dg/noncompile/920721-2.c,
	gcc.dg/noncompile/label-lineno-1.c, objc.dg/const-str-1.m,
	objc.dg/const-str-2.m, objc.dg/method-1.m: Likewise.

From-SVN: r49571