[PATCH v3 for-7.2 0/6] Add format attributes and fix format strings

[Stefan Weil]

v3:
- Fix description for patch 3
- Add patches 5 and 6

The patches 3 and 5 still need reviews!

[PATCH v3 for-7.2 1/6] libvhost-user: Fix wrong type of argument to
[PATCH v3 for-7.2 2/6] libvhost-user: Fix format strings
[PATCH v3 for-7.2 3/6] libvhost-user: Fix two more format strings
[PATCH v3 for-7.2 4/6] libvhost-user: Add format attribute to local
[PATCH v3 for-7.2 5/6] MAINTAINERS: Add subprojects/libvhost-user to
[PATCH v3 for-7.2 6/6] Add G_GNUC_PRINTF to function