Use mh_err_memory to report low memory diagnostics.

@@ -97,10 +97,7 @@ mh_argp_parse (int argc, char **argv,
       _argc = argc + xargc;
       _argv = calloc (_argc+1, sizeof *_argv);
       if (!_argv)
-	{
-	  mh_error (_("not enough memory"));
-	  abort ();
-	}
+        mh_err_memory (1);
 
       i = 0;
       _argv[i++] = argv[0];

@@ -27,20 +27,14 @@ mh_context_create (char *name, int copy)
   mh_context_t *ctx;
   ctx = malloc (sizeof (*ctx));
   if (!ctx)
-    {
-      mu_error (_("not enough memory"));
-      abort ();
-    }
+    mh_err_memory (1);
   if (copy)
     ctx->name = name;
   else
     {
       ctx->name = strdup (name);
       if (!ctx->name)
-	{
-	  mu_error (_("not enough memory"));
-	  abort ();
-	}
+        mh_err_memory (1);
     }
   ctx->header = NULL;
   return ctx;

@@ -31,10 +31,7 @@ _expand (size_t *msgcnt, size_t **msglist, size_t inc)
   *msgcnt += inc;
   *msglist = realloc (*msglist, (*msgcnt)*sizeof(**msglist));
   if (!*msglist)
-    {
-      mh_error (_("not enough memory"));
-      abort ();
-    }
+    mh_err_memory (1);
 }
 
 /* Fatal error handler */ 
@@ -589,10 +586,7 @@ mh_msgset_negate (mailbox_t mbox, mh_msgset_t *msgset)
   mailbox_messages_count (mbox, &total);
   list = calloc (total, sizeof (list[0]));
   if (!list)
-    {
-      mh_error (_("not enough memory"));
-      abort ();
-    }
+    mh_err_memory (1);
 
   for (i = 1, msgno = 0; i <= total; i++)
     {

@@ -291,7 +291,7 @@ edit (struct mh_whatnow_env *wh, int argc, char **argv, int *status)
       xargv = calloc (argc+2, sizeof (*xargv));
       if (!xargv)
         {
-	  mh_error (_("not enough memory"));
+          mh_err_memory (0);
 	  return 0;
 	}