Fixed error checking condition on swd_bus_write_request().
Fixed error checking condition on swd_bus_write_request().

shangdawei/LibSWD,cedar-renjun/LibSWD,ongjohn/LibSWD,cedar-renjun/LibSWD,ongjohn/LibSWD,cedar-renjun/LibSWD,shangdawei/LibSWD,ongjohn/LibSWD,shangdawei/LibSWD