lib/sort.c: move include inside #if 0

The sort function and its helpers don't do memory allocation, so the
slab.h include is redundant. Move it inside the #if 0 protecting the
self-test, similar to how it is done in lib/list_sort.c. This removes
over 450 lines from the generated dependency file.

Signed-off-by: Rasmus Villemoes <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

lib/sort.c

···
 #include <linux/types.h>
 #include <linux/export.h>
 #include <linux/sort.h>
-#include <linux/slab.h>
 
 static void u32_swap(void *a, void *b, int size)
 {
···
 EXPORT_SYMBOL(sort);
 
 #if 0
+#include <linux/slab.h>
 /* a simple boot-time regression test */
 
 int cmpint(const void *a, const void *b)