[pushed] Remove useless NULL check in python.c

[Tom Tromey <tromey@adacore.com>]

I noticed that do_start_initialization, in python.c, checks the result
of xmalloc.  However, xmalloc cannot fail, so this check is useless.
This patch also changes the code to use XNEWVEC.

gdb/ChangeLog
2020-02-19  Tom Tromey  <tromey@adacore.com>

	* python/python.c (do_start_initialization): Use XNEWVEC.  Remove
	NULL check.
---
 gdb/ChangeLog       | 5 +++++
 gdb/python/python.c | 7 +------
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/gdb/python/python.c b/gdb/python/python.c
index 27d6042c618..fbbc159ede3 100644
--- a/gdb/python/python.c
+++ b/gdb/python/python.c
@@ -1679,12 +1679,7 @@ do_start_initialization ()
   std::string oldloc = setlocale (LC_ALL, NULL);
   setlocale (LC_ALL, "");
   progsize = strlen (progname.get ());
-  progname_copy = (wchar_t *) xmalloc ((progsize + 1) * sizeof (wchar_t));
-  if (!progname_copy)
-    {
-      fprintf (stderr, "out of memory\n");
-      return false;
-    }
+  progname_copy = XNEWVEC (wchar_t, progsize + 1);
   count = mbstowcs (progname_copy, progname.get (), progsize + 1);
   if (count == (size_t) -1)
     {
-- 
2.21.1