initialise display
initialise display

fixes valgrind:
==25178== Conditional jump or move depends on uninitialised value(s)
==25178==    at 0x409E2C: display_create (window.c:1582)
==25178==    by 0x407A43: main (terminal.c:2323)
and
==13793== Conditional jump or move depends on uninitialised value(s)
==13793==    at 0x40A2D1: display_handle_global (window.c:1504)
==13793==    by 0x4E2C183: display_handle_global (wayland-client.c:281)
==13793==    by 0x713FEE7: ffi_call_unix64 (in /usr/lib/libffi.so.5.0.10)
==13793==    by 0x713FC83: ffi_call (in /usr/lib/libffi.so.5.0.10)
==13793==    by 0x4E2C71A: wl_closure_invoke (connection.c:663)
==13793==    by 0x4E2BB7B: wl_display_iterate (wayland-client.c:484)
==13793==    by 0x4096CA: display_create (window.c:1664)
==13793==    by 0x407A43: main (terminal.c:2321)

jonnylamb/weston,sir-murray/wayland,bitfactor/wayland,Fantu/compositor-spice,sir-murray/wayland,krezovic/weston,Tarnyko/weston-xdg_surface_present,kwm81/weston,sir-murray/wayland,giucam/weston,xorgy/weston,abooij/wayland,mchalupa/wayland,Fantu/compositor-spice,mchalupa/wayland,xorgy/weston,tulcod/wayland,sir-murray/weston,mchalupa/weston,krezovic/weston,tulcod/wayland,eyolfson/wayland,udoprog/weston,giucam/weston,abooij/wayland,bitfactor/wayland,tulcod/wayland,kwm81/weston,bitfactor/wayland,Gnurou/weston,eyolfson/weston,eyolfson/wayland,mchalupa/weston,Fantu/compositor-spice,eyolfson/wayland,abooij/wayland,udoprog/weston,eyolfson/weston,mchalupa/wayland,sir-murray/weston,Gnurou/weston,jonnylamb/weston,Tarnyko/weston-xdg_surface_present