cmd: unzip: use correct format code

src_len is defined as unsigned long. So use %lu for printf().

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/cmd/unzip.c b/cmd/unzip.c
index f7aabf7..6c0f97c 100644
--- a/cmd/unzip.c
+++ b/cmd/unzip.c
@@ -27,7 +27,7 @@
 	if (gunzip((void *) dst, dst_len, (void *) src, &src_len) != 0)
 		return 1;
 
-	printf("Uncompressed size: %ld = 0x%lX\n", src_len, src_len);
+	printf("Uncompressed size: %lu = 0x%lX\n", src_len, src_len);
 	env_set_hex("filesize", src_len);
 
 	return 0;