remoteproc: imx_rproc: add missing of_node_put

After of_parse_phandle, we need of_node_put to decrease the refcount
of the device_node.

Reported-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/1617846289-13496-2-git-send-email-peng.fan@oss.nxp.com
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

drivers/remoteproc/imx_rproc.c

@@ -459,6 +459,8 @@ static int imx_rproc_addr_init(struct imx_rproc *priv,
 			return err;
 		}
 
+		of_node_put(node);
+
 		if (b >= IMX7D_RPROC_MEM_MAX)
 			break;