cmd: upl: initialize unit test state

do_upl_write() calls upl_get_test_data() which may increment the fail
count in the unit test state. We should initialize it.

Addresses-Coverity-ID: 510465 Uninitialized scalar variable
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Neha Malcom Francis <n-francis@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

cmd/upl.c

@@ -50,7 +50,7 @@ static int do_upl_write(struct cmd_tbl *cmdtp, int flag, int argc,
 			char *const argv[])
 {
 	struct upl s_upl, *upl = &s_upl;
-	struct unit_test_state uts;
+	struct unit_test_state uts = { 0 };
 	struct abuf buf;
 	oftree tree;
 	ulong addr;