libxtables: prefix/order - strtoui

This commit also throws out the redundant string_to_number_*.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
diff --git a/extensions/libipt_LOG.c b/extensions/libipt_LOG.c
index 2aee910..aefb54a 100644
--- a/extensions/libipt_LOG.c
+++ b/extensions/libipt_LOG.c
@@ -70,7 +70,7 @@
 	unsigned int lev = -1;
 	unsigned int set = 0;
 
-	if (string_to_number(level, 0, 7, &lev) == -1) {
+	if (!xtables_strtoui(level, NULL, &lev, 0, 7)) {
 		unsigned int i = 0;
 
 		for (i = 0;