Global devargs syntax is used as device iteration filter like
"class=vdpa", a devargs without bus args is valid from parsing
perspective.
This patch makes bus args optional.
Fixes: d2a66ad794 ("bus: add device arguments name parsing")
Signed-off-by: Xueming Li <xuemingl@nvidia.com>
Reviewed-by: Gaetan Rivet <grive@u256.net>
5adef306da