From: Juanma Barranquero <lekktu@gmail.com>
Date: Fri, 8 Jun 2007 20:11:56 +0000 (+0000)
Subject: (Fmapconcat): Use empty_unibyte_string.
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(Fmapconcat): Use empty_unibyte_string.
---

diff --git a/src/fns.c b/src/fns.c
index 661a3ea1887..379b1321e08 100644
--- a/src/fns.c
+++ b/src/fns.c
@@ -3134,7 +3134,7 @@ SEQUENCE may be a list, a vector, a bool-vector, or a string.  */)
   len = Flength (sequence);
   leni = XINT (len);
   nargs = leni + leni - 1;
-  if (nargs < 0) return build_string ("");
+  if (nargs < 0) return empty_unibyte_string;
 
   SAFE_ALLOCA_LISP (args, nargs);