Use the dev_t converter for st_rdev

[serhiy-storchaka]

Bug report

The st_rdev field of struct stat has type dev_t. So, it should use the same converted as for the st_dev field. This allows to support large device numbers, see #89928.

Linked PRs

• gh-138779: Use the dev_t converter for st_rdev #138780
• [3.14] gh-138779: Use the dev_t converter for st_rdev (GH-138780) #138926
• [3.13] gh-138779: Use the dev_t converter for st_rdev (GH-138780) #138927