arch/m68k/mm/sun3mmu.c: Eliminate NULL test and memset after alloc_bo…

…otmem

As noted by Akinobu Mita in patch b1fceac,
alloc_bootmem and related functions never return NULL and always return a
zeroed region of memory.  Thus a NULL test or memset after calls to these
functions is unnecessary.

This was fixed using the following semantic patch.
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@@
expression E;
statement S;
@@

E = \(alloc_bootmem\|alloc_bootmem_low\|alloc_bootmem_pages\|alloc_bootmem_low_pages\)(...)
.. when != E
(
- BUG_ON (E == NULL);
|
- if (E == NULL) S
)

@@
expression E,E1;
@@

E = \(alloc_bootmem\|alloc_bootmem_low\|alloc_bootmem_pages\|alloc_bootmem_low_pages\)(...)
.. when != E
- memset(E,0,E1);
// </smpl>

Signed-off-by: Julia Lawall <[email protected]>
Signed-off-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

arch/m68k/mm/sun3mmu.c

@@ -53,7 +53,6 @@ void __init paging_init(void)
 	wp_works_ok = 0;
 #endif
 	empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
-	memset(empty_zero_page, 0, PAGE_SIZE);
 
 	address = PAGE_OFFSET;
 	pg_dir = swapper_pg_dir;