Supplementary for the fix of the lock removal.

Fu Juntang

2021-09-03 b386f0c5d35994a54e95d5fe1c4bcbfd1cdea59c

 src/bus_error.h

@@ -17,6 +17,7 @@
#define EBUS_RES_BUSY  510
#define EBUS_RES_NO  511
#define EBUS_INVALID_PARA  512
#define EBUS_NO_MEM       513

extern int bus_errno;