_xcb_parse_display: Fix error path
_xcb_parse_display: Fix error path

xcb_parse_display claims that there is no side effects when failing.
That requires _xcb_parse_display to free the memory in failure case.

Signed-off-by: Pauli Nieminen <4e6a41b08adc3c3d590c1b7c74c2c88bbfa53a98@nokia.com>
Signed-off-by: Peter Harris <859d2524afe9d1b926cf5c02089ad1cbab640cc0@opentext.com>

stapelberg/libxcb,stapelberg/libxcb,stapelberg/libxcb