[POWERPC] Fix invalid semicolon after if statement

A similar fix to netfilter from Eric Dumazet inspired me to
look around a bit by using some grep/sed stuff as looking for
this kind of bugs seemed easy to automate.  This is one of them
I found where it looks like this semicolon is not valid.
Signed-off-by: NIlpo Järvinen <ilpo.jarvinen@helsinki.fi>
Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

arch/powerpc/mm/hash_utils_64.c

@@ -795,7 +795,7 @@ void hash_preload(struct mm_struct *mm, unsigned long ea,
 
 #ifdef CONFIG_PPC_MM_SLICES
 	/* We only prefault standard pages for now */
-	if (unlikely(get_slice_psize(mm, ea) != mm->context.user_psize));
+	if (unlikely(get_slice_psize(mm, ea) != mm->context.user_psize))
 		return;
 #endif