dmaengine: coh901318: 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: Linus Walleij <[e-mail]>
Cc: Vinod Koul <[e-mail]>
Cc: Dan Williams <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>
Reviewed-by: Linus Walleij <[e-mail]>
Signed-off-by: Vinod Koul <[e-mail]>

drivers/dma/coh901318.c

···
 
 	dma_dentry = debugfs_create_dir("dma", NULL);
 
-	(void) debugfs_create_file("status",
-				   S_IFREG | S_IRUGO,
-				   dma_dentry, NULL,
-				   &coh901318_debugfs_status_operations);
+	debugfs_create_file("status", S_IFREG | S_IRUGO, dma_dentry, NULL,
+			    &coh901318_debugfs_status_operations);
 	return 0;
 }