mm: correct typo in MMAP_STATE() macro

We mistakenly refer to len rather than len_ here.  The only existing
caller passes len to the len_ parameter so this has no impact on the code,
but it is obviously incorrect to do this, so fix it.

Link: https://lkml.kernel.org/r/20241118175414.390827-1-lorenzo.stoakes@oracle.com
Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
Cc: Jann Horn <jannh@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: lorenzo-stoakes

mm/vma.c

@@ -35,7 +35,7 @@ struct mmap_state {
 		.mm = mm_,						\
 		.vmi = vmi_,						\
 		.addr = addr_,						\
-		.end = (addr_) + len,					\
+		.end = (addr_) + (len_),				\
 		.pgoff = pgoff_,					\
 		.pglen = PHYS_PFN(len_),				\
 		.flags = flags_,					\