[RFA 4/5] Change one more spot to use gdbpy_ref

[Tom Tromey <tom@tromey.com>]

This patch changes one more spot in the Python layer to use gdbpy_ref.

2017-01-15  Tom Tromey  <tom@tromey.com>

	* python/py-prettyprint.c (pretty_print_one_value): Use
	gdbpy_ref.
---
 gdb/ChangeLog               |  5 +++++
 gdb/python/py-prettyprint.c | 15 ++++++++-------
 2 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 61e4ca4..c32192d 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,10 @@
 2017-01-15  Tom Tromey  <tom@tromey.com>
 
+	* python/py-prettyprint.c (pretty_print_one_value): Use
+	gdbpy_ref.
+
+2017-01-15  Tom Tromey  <tom@tromey.com>
+
 	* python/py-cmd.c (cmdpy_destroyer): Use gdbpy_subclass.
 	* python/py-breakpoint.c (gdbpy_breakpoint_deleted): Use
 	gdbpy_subclass.
diff --git a/gdb/python/py-prettyprint.c b/gdb/python/py-prettyprint.c
index d6d157a..6132201 100644
--- a/gdb/python/py-prettyprint.c
+++ b/gdb/python/py-prettyprint.c
@@ -189,21 +189,22 @@ find_pretty_printer (PyObject *value)
 static PyObject *
 pretty_print_one_value (PyObject *printer, struct value **out_value)
 {
-  PyObject *result = NULL;
+  gdbpy_ref result;
 
   *out_value = NULL;
   TRY
     {
-      result = PyObject_CallMethodObjArgs (printer, gdbpy_to_string_cst, NULL);
-      if (result)
+      result.reset (PyObject_CallMethodObjArgs (printer, gdbpy_to_string_cst,
+						NULL));
+      if (result != NULL)
 	{
-	  if (! gdbpy_is_string (result) && ! gdbpy_is_lazy_string (result)
+	  if (! gdbpy_is_string (result.get ())
+	      && ! gdbpy_is_lazy_string (result.get ())
 	      && result != Py_None)
 	    {
-	      *out_value = convert_value_from_python (result);
+	      *out_value = convert_value_from_python (result.get ());
 	      if (PyErr_Occurred ())
 		*out_value = NULL;
-	      Py_DECREF (result);
 	      result = NULL;
 	    }
 	}
@@ -213,7 +214,7 @@ pretty_print_one_value (PyObject *printer, struct value **out_value)
     }
   END_CATCH
 
-  return result;
+  return result.release ();
 }
 
 /* Return the display hint for the object printer, PRINTER.  Return
-- 
2.9.3