media: staging/imx7: Fix an error code in mipi_csis_clk_get()

We accidentally return IS_ERR(), which is 1, instead of the PTR_ERR()
which is the negative error code.

Fixes: 7807063b ("media: staging/imx7: add MIPI CSI-2 receiver subdev for i.MX7")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/staging/media/imx/imx7-mipi-csis.c

@@ -491,7 +491,7 @@ static int mipi_csis_clk_get(struct csi_state *state)
 
 	state->wrap_clk = devm_clk_get(dev, "wrap");
 	if (IS_ERR(state->wrap_clk))
-		return IS_ERR(state->wrap_clk);
+		return PTR_ERR(state->wrap_clk);
 
 	/* Set clock rate */
 	ret = clk_set_rate(state->wrap_clk, state->clk_frequency);