[RFA 09/13] Use gdb::def_vector in ppc-linux-tdep.c

[Tom Tromey <tom@tromey.com>]

This removes a cleanup from ppc-linux-tdep.c, replacing it with
gdb::def_vector.

gdb/ChangeLog
2017-11-02  Tom Tromey  <tom@tromey.com>

	* ppc-linux-tdep.c (ppc_linux_get_syscall_number): Use
	gdb::def_vector.
---
 gdb/ChangeLog        |  5 +++++
 gdb/ppc-linux-tdep.c | 13 ++++---------
 2 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/gdb/ppc-linux-tdep.c b/gdb/ppc-linux-tdep.c
index 847908a6da..4d10a24ca9 100644
--- a/gdb/ppc-linux-tdep.c
+++ b/gdb/ppc-linux-tdep.c
@@ -725,26 +725,21 @@ ppc_linux_get_syscall_number (struct gdbarch *gdbarch,
   struct regcache *regcache = get_thread_regcache (ptid);
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
-  struct cleanup *cleanbuf;
-  /* The content of a register */
-  gdb_byte *buf;
   /* The result */
   LONGEST ret;
 
   /* Make sure we're in a 32- or 64-bit machine */
   gdb_assert (tdep->wordsize == 4 || tdep->wordsize == 8);
 
-  buf = (gdb_byte *) xmalloc (tdep->wordsize * sizeof (gdb_byte));
-
-  cleanbuf = make_cleanup (xfree, buf);
+  /* The content of a register */
+  gdb::def_vector<gdb_byte> buf (tdep->wordsize);
 
   /* Getting the system call number from the register.
      When dealing with PowerPC architecture, this information
      is stored at 0th register.  */
-  regcache_cooked_read (regcache, tdep->ppc_gp0_regnum, buf);
+  regcache_cooked_read (regcache, tdep->ppc_gp0_regnum, buf.data ());
 
-  ret = extract_signed_integer (buf, tdep->wordsize, byte_order);
-  do_cleanups (cleanbuf);
+  ret = extract_signed_integer (buf.data (), tdep->wordsize, byte_order);
 
   return ret;
 }
-- 
2.13.6