fix typo in prefetch.h

Signed-off-by: NDave Jones <davej@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

include/linux/prefetch.h

@@ -27,7 +27,7 @@
 	
 	prefetch(x)  	- prefetches the cacheline at "x" for read
 	prefetchw(x)	- prefetches the cacheline at "x" for write
-	spin_lock_prefetch(x) - prefectches the spinlock *x for taking
+	spin_lock_prefetch(x) - prefetches the spinlock *x for taking
 	
 	there is also PREFETCH_STRIDE which is the architecure-prefered 
 	"lookahead" size for prefetching streamed operations.