e7c876ab0b
If either the master pointer or keyboard was disabled, the respective GetMaster() call returns NULL, causing a segfault later accessing the deviceid. Fix this by looking in the off_devices list for any master device of the type we're looking for. Master devices lose the pairing when disabled (on enabling a keyboard we simply pair with the first available unpaired pointer). And for readability, split the device we get from the protocol request into a new "dev" variable instead of re-using ptr. Fixes #1611 Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1256>
X Server
The X server accepts requests from client applications to create windows, which are (normally rectangular) "virtual screens" that the client program can draw into.
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