Log Message:
Update to 1.2.1:

libXi 1.2.1.
Fixes a potential memory overflow in XGetDeviceControl.

Alan Coopersmith (1):
Add README with pointers to mailing list, bugzilla & git repos

Paulo Cesar Pereira de Andrade (1):
Return NULL on error, and match LockDisplay with UnlockDisplay.

Peter Hutterer (3):
XGetDeviceControl: Add a missing break leading to wrong length calculation.
XGetDeviceControl: size the libXi structs, not the wire structs (#20293)
libXi 1.2.1