netfilter: x_tables: remove size check

Back in 2002 vmalloc used to BUG on too large sizes.  We are much better
behaved these days and vmalloc simply returns NULL for those.  Remove the
check as it simply not needed and the comment is even misleading.

Link: http://lkml.kernel.org/r/20180131081916.GO21609@dhcp22.suse.czSuggested-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NMichal Hocko <mhocko@suse.com>
Reviewed-by: NAndrew Morton <akpm@linux-foundation.org>
Cc: Florian Westphal <fw@strlen.de>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/x_tables.c

@@ -1004,10 +1004,6 @@ struct xt_table_info *xt_alloc_table_info(unsigned int size)
 	if (sz < sizeof(*info))
 		return NULL;
 
-	/* Pedantry: prevent them from hitting BUG() in vmalloc.c --RR */
-	if ((size >> PAGE_SHIFT) + 2 > totalram_pages)
-		return NULL;
-
 	/* __GFP_NORETRY is not fully supported by kvmalloc but it should
 	 * work reasonably well if sz is too large and bail out rather
 	 * than shoot all processes down before realizing there is nothing