[media] mantis: remove an uneeded goto

Gotos makes a little harder to check the code. In this
particular case, the goto is doing nothing but jumping into
a return.

Instead, just replace the goto by the return, making it
simpler.
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/pci/mantis/mantis_dma.c

@@ -140,12 +140,10 @@ int mantis_dma_init(struct mantis_pci *mantis)
 		/* Stop RISC Engine */
 		mmwrite(0, MANTIS_DMA_CTL);
 
-		goto err;
+		return err;
 	}
 
 	return 0;
-err:
-	return err;
 }
 EXPORT_SYMBOL_GPL(mantis_dma_init);