[RFA 2/2] Remove last cleanup from btrace code

[Tom Tromey <tom@tromey.com>]

This removes the last cleanup from btrace.c, replacing it with a use
of unique_xmalloc_ptr.

2018-06-07  Tom Tromey  <tom@tromey.com>

	* btrace.c (parse_xml_raw): Use gdb::unique_xmalloc_ptr.
---
 gdb/ChangeLog |  4 ++++
 gdb/btrace.c  | 11 ++++-------
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/gdb/btrace.c b/gdb/btrace.c
index 690770572e8..b8894a24ba0 100644
--- a/gdb/btrace.c
+++ b/gdb/btrace.c
@@ -2056,8 +2056,7 @@ static void
 parse_xml_raw (struct gdb_xml_parser *parser, const char *body_text,
 	       gdb_byte **pdata, size_t *psize)
 {
-  struct cleanup *cleanup;
-  gdb_byte *data, *bin;
+  gdb_byte *bin;
   size_t len, size;
 
   len = strlen (body_text);
@@ -2066,8 +2065,8 @@ parse_xml_raw (struct gdb_xml_parser *parser, const char *body_text,
 
   size = len / 2;
 
-  bin = data = (gdb_byte *) xmalloc (size);
-  cleanup = make_cleanup (xfree, data);
+  gdb::unique_xmalloc_ptr<gdb_byte> data ((gdb_byte *) xmalloc (size));
+  bin = data.get ();
 
   /* We use hex encoding - see common/rsp-low.h.  */
   while (len > 0)
@@ -2084,9 +2083,7 @@ parse_xml_raw (struct gdb_xml_parser *parser, const char *body_text,
       len -= 2;
     }
 
-  discard_cleanups (cleanup);
-
-  *pdata = data;
+  *pdata = data.release ();
   *psize = size;
 }
 
-- 
2.13.6