alpha: fix boot/main.c warning

In current 2.6.23-rc1+git, make bootimage gives the following warning while
compiling arch/alpha/boot/main.c.  The patch below fixes the warning by
casting callback argument explicitly to void*.  The original value comes from
START_ADDR macro and is clearly numeric so only cast it for the callback.

  CC      arch/alpha/boot/main.o
arch/alpha/boot/main.c: In function 'load':
arch/alpha/boot/main.c:135: warning: passing argument 3 of 'callback_read' makes pointer from integer without a cast

Signed-off-by: Meelis Roos <[email protected]>
Cc: Jay Estabrook <[email protected]>
Cc: Ivan Kokshaysky <[email protected]>
Cc: Richard Henderson <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

arch/alpha/boot/main.c

@@ -132,7 +132,7 @@ static inline long load(long dev, unsigned long addr, unsigned long count)
 	if (result)
 		srm_printk("Boot file specification (%s) not implemented\n",
 		       bootfile);
-	return callback_read(dev, count, addr, boot_size/512 + 1);
+	return callback_read(dev, count, (void *)addr, boot_size/512 + 1);
 }
 
 /*