egl/x11: set EGL_BAD_NATIVE_(PIXMAP|WINDOW) for invalid pixmaps/windows

egl/x11: set EGL_BAD_NATIVE_(PIXMAP|WINDOW) for invalid pixmaps/windows

Both eglCreatePixmapSurface and eglCreateWindowSurface were incorrectly
setting the EGL error to be EGL_BAD_ALLOC when an invalid native drawable
handle was being passed in. The EGL spec states the following for
eglCreatePixmapSurface:

	"If pixmap is not a valid native pixmap handle, then an EGL_BAD_-
	 NATIVE_PIXMAP error should be generated."

(eglCreateWindowSurface has similar text)

Correctly set the EGL error value based on xcb_get_geometry_reply returning
an error structure containing something other than BadAlloc.

v2: Check for BadAlloc error and update commit message to reflect this

Signed-off-by: Frank Binns <frank.binns@imgtec.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>