cppcheck: catch json_list_for_each

cppcheck on bionic doesn't like this it seems.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Makefile

@@ -330,7 +330,7 @@ check-includes:
 
 # cppcheck gets confused by list_for_each(head, i, list): thinks i is uninit.
 .cppcheck-suppress:
-	@git ls-files -- "*.c" "*.h" | grep -vE '^ccan/' | xargs grep -n 'list_for_each' | sed 's/\([^:]*:.*\):.*/uninitvar:\1/' > $@
+	@git ls-files -- "*.c" "*.h" | grep -vE '^ccan/' | xargs grep -n '_for_each' | sed 's/\([^:]*:.*\):.*/uninitvar:\1/' > $@
 
 check-cppcheck: .cppcheck-suppress
 	@trap 'rm -f .cppcheck-suppress' 0; git ls-files -- "*.c" "*.h" | grep -vE '^ccan/' | xargs cppcheck -q --language=c --std=c11 --error-exitcode=1 --suppressions-list=.cppcheck-suppress --inline-suppr