use the new coding style in scripts

there were stragglers left over from the last audit,
and these stragglers still exist even after all the
major re-factoring as of late

the new style is: bsd-like coding style and error
handling. verbose yet simple error handling. we use
an "err" function in a way reminiscent of most C
programs that you see in openbsd base (err.h)

this style is very clean, resulting in readable code

Signed-off-by: Leah Rowe <leah@libreboot.org>

resources/scripts/build/clean/crossgcc

@@ -29,9 +29,14 @@ main()
 	printf "Cleaning crossgcc builds in all coreboot archives\n"
 	[ ! -d "coreboot/" ] && exit 0
 
+	clean_crossgcc
+}
+
+clean_crossgcc()
+{
 	for board in coreboot/*; do
+		[ -d "${board}" ] || continue
 		[ "${board##*/}" = "coreboot" ] && continue
-		[ ! -d "${board}" ] && continue
 		make -C "${board}/" crossgcc-clean || err "make-clean"
 	done
 }