dm: fdt: Correct handling of aliases with embedded digits

Since we scan from left to right looking for the first digit, "i2c0" returns
2 instead of 0 for the alias number. Adjust the code to scan from right to
left instead.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Tom Rini <trini@ti.com>
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index 9714620..da6ef6b 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -355,9 +355,9 @@
 		slash = strrchr(prop, '/');
 		if (strcmp(slash + 1, find_name))
 			continue;
-		for (p = name; *p; p++) {
-			if (isdigit(*p)) {
-				*seqp = simple_strtoul(p, NULL, 10);
+		for (p = name + strlen(name) - 1; p > name; p--) {
+			if (!isdigit(*p)) {
+				*seqp = simple_strtoul(p + 1, NULL, 10);
 				debug("Found seq %d\n", *seqp);
 				return 0;
 			}