MIPS: Alchemy: Simplify DMA channel allocation code.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Manuel Lauss <manuel.lauss@googlemail.com>

arch/mips/alchemy/common/dbdma.c

@@ -237,7 +237,7 @@ u32 au1xxx_dbdma_chan_alloc(u32 srcid, u32 destid,
        void (*callback)(int, void *), void *callparam)
 {
 	unsigned long   flags;
-	u32		used, chan, rv;
+	u32		used, chan;
 	u32		dcp;
 	int		i;
 	dbdev_tab_t	*stp, *dtp;
@@ -260,7 +260,6 @@ u32 au1xxx_dbdma_chan_alloc(u32 srcid, u32 destid,
 		return 0;
 
 	used = 0;
-	rv = 0;
 
 	/* Check to see if we can get both channels. */
 	spin_lock_irqsave(&au1xxx_dbdma_spin_lock, flags);
@@ -281,7 +280,9 @@ u32 au1xxx_dbdma_chan_alloc(u32 srcid, u32 destid,
 		used++;
 	spin_unlock_irqrestore(&au1xxx_dbdma_spin_lock, flags);
 
-	if (!used) {
+	if (used)
+		return 0;
+
 	/* Let's see if we can allocate a channel for it. */
 	ctp = NULL;
 	chan = 0;
@@ -326,18 +327,18 @@ u32 au1xxx_dbdma_chan_alloc(u32 srcid, u32 destid,
 		cp->ddma_cfg = i;
 		au_sync();
 
-			/* Return a non-zero value that can be used to
-			 * find the channel information in subsequent
-			 * operations.
+		/*
+		 * Return a non-zero value that can be used to find the channel
+		 * information in subsequent operations.
 		 */
-			rv = (u32)(&chan_tab_ptr[chan]);
-		} else {
+		return (u32)(&chan_tab_ptr[chan]);
+	}
+
 	/* Release devices */
 	stp->dev_flags &= ~DEV_FLAGS_INUSE;
 	dtp->dev_flags &= ~DEV_FLAGS_INUSE;
-		}
-	}
-	return rv;
+
+	return 0;
 }
 EXPORT_SYMBOL(au1xxx_dbdma_chan_alloc);