staging: fsl-mc/dpio: Add missing argument identifier

When running checkpatch over the DPIO code the following warning
is reported:

WARNING: function definition argument 'struct dpaa2_io_notification_ctx *' should also have an identifier name

Add the missing identifier.
Signed-off-by: Roy Pledge <roy.pledge@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/fsl-mc/include/dpaa2-io.h

@@ -80,7 +80,7 @@ struct dpaa2_io *dpaa2_io_service_select(int cpu);
  * Used when a FQDAN/CDAN registration is made by drivers.
  */
 struct dpaa2_io_notification_ctx {
-	void (*cb)(struct dpaa2_io_notification_ctx *);
+	void (*cb)(struct dpaa2_io_notification_ctx *ctx);
 	int is_cdan;
 	u32 id;
 	int desired_cpu;