dmaengine: amba-pl08x: no need to cast away call to debugfs_create_file()

No need to check the return value of debugfs_create_file(), so no need
to provide a fake "cast away" of the return value either.

Cc: Dan Williams <[e-mail]>
Cc: Vinod Koul <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>
Signed-off-by: Vinod Koul <[e-mail]>

drivers/dma/amba-pl08x.c

···
 static void init_pl08x_debugfs(struct pl08x_driver_data *pl08x)
 {
 	/* Expose a simple debugfs interface to view all clocks */
-	(void) debugfs_create_file(dev_name(&pl08x->adev->dev),
-			S_IFREG | S_IRUGO, NULL, pl08x,
-			&pl08x_debugfs_fops);
+	debugfs_create_file(dev_name(&pl08x->adev->dev), S_IFREG | S_IRUGO,
+			    NULL, pl08x, &pl08x_debugfs_fops);
 }
 
 #else