mpz/aors_ui.h: No realloc if size was zero.

1 files changed, 10 insertions, 11 deletions

diff --git a/mpz/aors_ui.h b/mpz/aors_ui.h
index e46726747..6437cf370 100644
--- a/mpz/aors_ui.h
+++ b/mpz/aors_ui.h
@@ -1,8 +1,8 @@
 /* mpz_add_ui, mpz_sub_ui -- Add or subtract an mpz_t and an unsigned
    one-word integer.
 
-Copyright 1991, 1993, 1994, 1996, 1999, 2000, 2001, 2002, 2004, 2012 Free
-Software Foundation, Inc.
+Copyright 1991, 1993, 1994, 1996, 1999, 2000, 2001, 2002, 2004, 2012,
+2013 Free Software Foundation, Inc.
 
 This file is part of the GNU MP Library.
 
@@ -67,22 +67,21 @@ FUNCTION (mpz_ptr w, mpz_srcptr u, unsigned long int vval)
 #endif
 
   usize = SIZ (u);
+  if (usize == 0)
+    {
+      PTR (w)[0] = vval;
+      SIZ (w) = VARIATION_NEG (vval != 0);
+      return;
+    }
+
   abs_usize = ABS (usize);
 
   /* If not space for W (and possible carry), increase space.  */
-  wsize = abs_usize + 1;
-  wp = MPZ_REALLOC (w, wsize);
+  wp = MPZ_REALLOC (w, abs_usize + 1);
 
   /* These must be after realloc (U may be the same as W).  */
   up = PTR (u);
 
-  if (abs_usize == 0)
-    {
-      wp[0] = vval;
-      SIZ (w) = VARIATION_NEG (vval != 0);
-      return;
-    }
-
   if (usize VARIATION_CMP 0)
     {
       mp_limb_t cy;