[PATCH 2/4] dfa: omit unnecessary ptrdiff_t check

[Paul Eggert]

* lib/dfa.c (alloc_position_set): Do not worry about ptrdiff_t
overflow, since xnmalloc does that now.
---
 ChangeLog | 4 ++++
 lib/dfa.c | 2 --
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index beeefb7..91cdc6d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2017-01-09  Paul Eggert  <egg...@cs.ucla.edu>
 
+       dfa: omit unnecessary ptrdiff_t check
+       * lib/dfa.c (alloc_position_set): Do not worry about ptrdiff_t
+       overflow, since xnmalloc does that now.
+
        dfa: omit unnecessary allocation
        * lib/dfa.c (dfaanalyze): Do not allocate follow set, since
        an all-zero follow set works just fine.
diff --git a/lib/dfa.c b/lib/dfa.c
index b27bef4..509d6d1 100644
--- a/lib/dfa.c
+++ b/lib/dfa.c
@@ -2007,8 +2007,6 @@ static void
 alloc_position_set (position_set *s, size_t size)
 {
   s->elems = xnmalloc (size, sizeof *s->elems);
-  if (PTRDIFF_MAX < SIZE_MAX / sizeof *s->elems && PTRDIFF_MAX < size)
-    xalloc_die ();
   s->alloc = size;
   s->nelem = 0;
 }
-- 
2.9.3