[python] fix merge lossage

[python] fix merge lossage

[Tom Tromey]

This patch fixes a couple problems introduced during the last merge.

Tom

diff --git a/gdb/testsuite/gdb.python/python-prettyprint.c b/gdb/testsuite/gdb.python/python-prettyprint.c
index fe2fd25..5cc35be 100644
--- a/gdb/testsuite/gdb.python/python-prettyprint.c
+++ b/gdb/testsuite/gdb.python/python-prettyprint.c
@@ -175,10 +175,6 @@ main ()
   ns.null_str = "embedded\0null\0string";
   ns.length = 20;
 
-  struct ns  ns;
-  ns.null_str = "embedded\0null\0string";
-  ns.length = 20;
-
 #ifdef __cplusplus
   S cps;
 
diff --git a/gdb/testsuite/gdb.python/python-prettyprint.py b/gdb/testsuite/gdb.python/python-prettyprint.py
index 828802a..c3e0dc4 100644
--- a/gdb/testsuite/gdb.python/python-prettyprint.py
+++ b/gdb/testsuite/gdb.python/python-prettyprint.py
@@ -92,6 +92,13 @@ class pp_vbase1:
     def to_string (self):
         return "pp class name: " + self.val.type.tag
 
+class pp_nullstr:
+    def __init__(self, val):
+        self.val = val
+
+    def to_string(self):
+        return self.val['s'].string(gdb.parameter('target-charset'))
+
 class pp_ns:
     "Print a std::basic_string of some kind"
 
@@ -149,6 +156,9 @@ def register_pretty_printers ():
     pretty_printers_dict[re.compile ('^VirtualTest$')] =  pp_multiple_virtual
     pretty_printers_dict[re.compile ('^Vbase1$')] =  pp_vbase1
 
+    pretty_printers_dict[re.compile ('^struct nullstr$')] = pp_nullstr
+    pretty_printers_dict[re.compile ('^nullstr$')] = pp_nullstr
+    
     # Note that we purposely omit the typedef names here.
     # Printer lookup is based on canonical name.
     # However, we do need both tagged and untagged variants, to handle