[PATCH 3/4] btrfs-progs: libbtrfsutil: Convert to designated initialization for QgroupInherit_type

[Qu Wenruo <wqu@suse.com>]

[BUG]
When compiling btrfs-progs with libbtrfsutil on a python3.8 system, we
got the following warning:

  qgroup.c:110:2: warning: initialization of ‘long int’ from ‘void *’ makes integer from pointer without a cast [-Wint-conversion]
    110 |  NULL,     /* tp_print */
        |  ^~~~
  qgroup.c:110:2: note: (near initialization for ‘QgroupInherit_type.tp_vectorcall_offset’)

[CAUSE]
C definition of PyTypeObject changed in python 3.8.
Now at the old tp_print, we have tp_vectorcall_offset.

So we got above warning.

[FIX]
C has designated initialization, which can assign values to each named
member, without hard coding to match the offset.
And all the other uninitialized values will be set to 0, so we can save
a lot of unneeded "= 0" or "= NULL" lines.

Just use that awesome feature to avoid any future breakage.

Signed-off-by: Qu Wenruo <wqu@suse.com>
---
 libbtrfsutil/python/qgroup.c | 43 +++++++-----------------------------
 1 file changed, 8 insertions(+), 35 deletions(-)

diff --git a/libbtrfsutil/python/qgroup.c b/libbtrfsutil/python/qgroup.c
index 44ac5ebc19d2..163fbbf077e6 100644
--- a/libbtrfsutil/python/qgroup.c
+++ b/libbtrfsutil/python/qgroup.c
@@ -103,39 +103,12 @@ static PyMethodDef QgroupInherit_methods[] = {
 
 PyTypeObject QgroupInherit_type = {
 	PyVarObject_HEAD_INIT(NULL, 0)
-	"btrfsutil.QgroupInherit",		/* tp_name */
-	sizeof(QgroupInherit),			/* tp_basicsize */
-	0,					/* tp_itemsize */
-	(destructor)QgroupInherit_dealloc,	/* tp_dealloc */
-	NULL,					/* tp_print */
-	NULL,					/* tp_getattr */
-	NULL,					/* tp_setattr */
-	NULL,					/* tp_as_async */
-	NULL,					/* tp_repr */
-	NULL,					/* tp_as_number */
-	NULL,					/* tp_as_sequence */
-	NULL,					/* tp_as_mapping */
-	NULL,					/* tp_hash  */
-	NULL,					/* tp_call */
-	NULL,					/* tp_str */
-	(getattrofunc)QgroupInherit_getattro,	/* tp_getattro */
-	NULL,					/* tp_setattro */
-	NULL,					/* tp_as_buffer */
-	Py_TPFLAGS_DEFAULT,			/* tp_flags */
-	QgroupInherit_DOC,			/* tp_doc */
-	NULL,					/* tp_traverse */
-	NULL,					/* tp_clear */
-	NULL,					/* tp_richcompare */
-	0,					/* tp_weaklistoffset */
-	NULL,					/* tp_iter */
-	NULL,					/* tp_iternext */
-	QgroupInherit_methods,			/* tp_methods */
-	NULL,					/* tp_members */
-	NULL,					/* tp_getset */
-	NULL,					/* tp_base */
-	NULL,					/* tp_dict */
-	NULL,					/* tp_descr_get */
-	NULL,					/* tp_descr_set */
-	0,					/* tp_dictoffset */
-	(initproc)QgroupInherit_init,		/* tp_init */
+	.tp_name		= "btrfsutil.QgroupInherit",
+	.tp_basicsize		= sizeof(QgroupInherit),
+	.tp_dealloc		= (destructor)QgroupInherit_dealloc,
+	.tp_getattro		= (getattrofunc)QgroupInherit_getattro,
+	.tp_flags		= Py_TPFLAGS_DEFAULT,
+	.tp_doc			= QgroupInherit_DOC,
+	.tp_methods		= QgroupInherit_methods,
+	.tp_init		= (initproc)QgroupInherit_init,
 };
-- 
2.24.0