sh: Kill off volatile silliness in sq_flush_range().

  CC      arch/sh/kernel/cpu/sh4/sq.o
arch/sh/kernel/cpu/sh4/sq.c: In function 'sq_flush_range':
arch/sh/kernel/cpu/sh4/sq.c:65: warning: passing argument 1 of 'prefetch' discards qualifiers from pointer target type

This didn't actually need to be volatile in the first place, so just
kill off the qualifier entirely.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/kernel/cpu/sh4/sq.c

@@ -58,11 +58,11 @@ do {						\
  */
 void sq_flush_range(unsigned long start, unsigned int len)
 {
-	volatile unsigned long *sq = (unsigned long *)start;
+	unsigned long *sq = (unsigned long *)start;
 
 	/* Flush the queues */
 	for (len >>= 5; len--; sq += 8)
-		prefetchw((void *)sq);
+		prefetchw(sq);
 
 	/* Wait for completion */
 	store_queue_barrier();