Fix minor bugs with printing null bytes

* minibuf.c (read_minibuf_noninteractive):
* xdisp.c (Ftrace_to_stderr) [GLYPH_DEBUG]:
Work even if the Lisp string contains a null byte.

src/ChangeLog

 2015-01-20  Paul Eggert  <eggert@cs.ucla.edu>
+	Fix minor bugs with printing null bytes
+	* minibuf.c (read_minibuf_noninteractive):
+	* xdisp.c (Ftrace_to_stderr) [GLYPH_DEBUG]:
+	Work even if the Lisp string contains a null byte.
+
 	Port to hypothetical case where Qnil is nonzero
 	* alloc.c (allocate_pseudovector):
 	* callint.c (Fcall_interactively):

src/minibuf.c

@@ -217,7 +217,7 @@ read_minibuf_noninteractive (Lisp_Object map, Lisp_Object initial,
       suppress_echo_on_tty (fileno (stdin));
     }
 
-  fprintf (stdout, "%s", SDATA (prompt));
+  fwrite (SDATA (prompt), 1, SBYTES (prompt), stdout);
   fflush (stdout);
 
   val = Qnil;

src/xdisp.c

@@ -18815,7 +18815,7 @@ usage: (trace-to-stderr STRING &rest OBJECTS)  */)
   (ptrdiff_t nargs, Lisp_Object *args)
 {
   Lisp_Object s = Fformat (nargs, args);
-  fprintf (stderr, "%s", SDATA (s));
+  fwrite (SDATA (s), 1, SBYTES (s), stderr);
   return Qnil;
 }