global: Convert simple_strtoul() with decimal to dectoul()

It is a pain to have to specify the value 10 in each call. Add a new
dectoul() function and update the code to use it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/lib/dhry/cmd_dhry.c b/lib/dhry/cmd_dhry.c
index d55ab54..77b52a2 100644
--- a/lib/dhry/cmd_dhry.c
+++ b/lib/dhry/cmd_dhry.c
@@ -16,7 +16,7 @@
 	int iterations = 1000000;
 
 	if (argc > 1)
-		iterations = simple_strtoul(argv[1], NULL, 10);
+		iterations = dectoul(argv[1], NULL);
 
 	start = get_timer(0);
 	dhry(iterations);
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index 4b097fb..07c7ebe 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -405,7 +405,7 @@
 			continue;
 
 		/* Get the alias number */
-		number = simple_strtoul(path + name_len, NULL, 10);
+		number = dectoul(path + name_len, NULL);
 		if (number < 0 || number >= maxcount) {
 			debug("%s: warning: alias '%s' is out of range\n",
 			      __func__, path);
diff --git a/lib/net_utils.c b/lib/net_utils.c
index f596c8f..72a3b09 100644
--- a/lib/net_utils.c
+++ b/lib/net_utils.c
@@ -23,7 +23,7 @@
 		return addr;
 
 	for (addr.s_addr = 0, i = 0; i < 4; ++i) {
-		ulong val = s ? simple_strtoul(s, &e, 10) : 0;
+		ulong val = s ? dectoul(s, &e) : 0;
 		if (val > 255) {
 			addr.s_addr = 0;
 			return addr;
diff --git a/lib/strto.c b/lib/strto.c
index 57d6216..72903a5 100644
--- a/lib/strto.c
+++ b/lib/strto.c
@@ -54,6 +54,11 @@
 	return simple_strtoul(cp, endp, 16);
 }
 
+ulong dectoul(const char *cp, char **endp)
+{
+	return simple_strtoul(cp, endp, 10);
+}
+
 int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
 {
 	char *tail;
@@ -164,7 +169,7 @@
 	if (isdigit(end[-1])) {
 		for (p = end - 1; p > str; p--) {
 			if (!isdigit(*p))
-				return simple_strtoul(p + 1, NULL, 10);
+				return dectoul(p + 1, NULL);
 		}
 	}