Check that the FT_Face actually exists in SkTypeface_FreeType::onGetVariationDesignPosition.

All users of AutoFTAccess check the FT_Face for nullptr in case the
FT_Face cannot actually be created. This check was overlooked in the
recent addition of SkTypeface_FreeType::onGetVariationDesignPosition.

BUG=chromium:697878

Change-Id: I92dfe845f2aecfa00bd4d088ac139f74c019c03d
Reviewed-on: https://skia-review.googlesource.com/9151
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>

Cherry-pick: e7e5499c787a492d98f73445dea78b9dfb0f773b
Approval: https://crbug.com/705429#c5
1 file changed