spl: Add a parameter to spl_parse_image_header()

Instead of using the global spl_image variable, pass the required struct in
as an argument.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/common/spl/spl_ymodem.c b/common/spl/spl_ymodem.c
index 5402301..1323b6f 100644
--- a/common/spl/spl_ymodem.c
+++ b/common/spl/spl_ymodem.c
@@ -108,8 +108,9 @@
 		while ((res = xyzModem_stream_read(buf, BUF_SIZE, &err)) > 0)
 			size += res;
 	} else {
-		spl_parse_image_header((struct image_header *)buf);
-		ret = spl_parse_image_header((struct image_header *)buf);
+		spl_parse_image_header(&spl_image, (struct image_header *)buf);
+		ret = spl_parse_image_header(&spl_image,
+					     (struct image_header *)buf);
 		if (ret)
 			return ret;
 		addr = spl_image.load_addr;