maint.mk: avoid unexpanded \n in two diagnostics * top/maint.mk (sc_prohibit_always_true_header_tests): Don't use a literal \n in a halt=... assignment. It would not be expanded, and the two \n bytes would appear in the diagnostic output rather than the desired newline. Use halt=$$(printf ... instead. (sc_vulnerable_makefile_CVE-2009-4029): Likewise.