Avoid "'dc' may be uninitialized" warning.

	libiberty/
	* cp-demangle.c (d_demangle_callback): Put an abort call in place,
	to help the compiler.

From-SVN: r207200

libiberty/ChangeLog

+2014-01-28  Thomas Schwinge  <thomas@codesourcery.com>
+
+	* cp-demangle.c (d_demangle_callback): Put an abort call in place,
+	to help the compiler.
+
 2014-01-21  Tom Tromey  <tromey@redhat.com>
 
 	* _doprint.c (checkit): Use stdarg, not VA_* macros.

libiberty/cp-demangle.c

 /* Demangler for g++ V3 ABI.
-   Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
+   Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2014
    Free Software Foundation, Inc.
    Written by Ian Lance Taylor <ian@wasabisystems.com>.
 
@@ -5824,6 +5824,8 @@ d_demangle_callback (const char *mangled, int options,
 			  NULL);
 	d_advance (&di, strlen (d_str (&di)));
 	break;
+      default:
+	abort (); /* We have listed all the cases.  */
       }
 
     /* If DMGL_PARAMS is set, then if we didn't consume the entire