Fix uninitialised ref.
Submitted by: Julian Seward (who else!)
/* -----------------------------------------------------------------------------
- * $Id: Linker.c,v 1.145 2004/02/15 13:29:44 krasimir Exp $
+ * $Id: Linker.c,v 1.146 2004/03/22 11:06:18 simonmar Exp $
*
* (c) The GHC Team, 2000-2003
*
int r, n;
#ifdef USE_MMAP
int fd, pagesize;
- void *map_addr;
+ void *map_addr = NULL;
#else
FILE *f;
#endif