The logic in dualshock4_get_calibration_data() used uninitialised data
in case of a failed kzalloc() for the transfer buffer.

The solution is to group all business logic and all sanity checks
together, and jump only to the latter in case of an error.
While we're at it, factor out the axes' labelling, since it must happen
either way for input_report_abs() to succeed later on.

Thanks to Dan Carpenter for the Smatch static checker warning.

Fixes: a48a7cd8 ("HID: playstation: DS4: Don't fail on calibration data request")
Signed-off-by: Max Staudt <max@enpas.org>
Signed-off-by: Jiri Kosina <jkosina@suse.com>