Improve RM_Call() errno classification.
Improve RM_Call() errno classification.

RM_Call() will now use EBADF and ENONET in addition to EINVAL in order
to provide more information about errors (i.e. when return value is
NULL).

antirez/redis,charsyam/redis,yossigo/redis,neomantra/redis,ctripcorp/redis,pmem/redis,ofirluzon/redis,charsyam/redis,oranagra/redis,charsyam/redis,antirez/redis,antirez/redis,oranagra/redis,ofirluzon/redis,PKRoma/redis,ctripcorp/redis,yossigo/redis,neomantra/redis,PKRoma/redis,ctripcorp/redis,charsyam/redis,neomantra/redis,yossigo/redis,pmem/redis,soloestoy/redis,pmem/redis,PKRoma/redis,oranagra/redis,ofirluzon/redis,PKRoma/redis,antirez/redis,ofirluzon/redis,neomantra/redis,PKRoma/redis,yossigo/redis,oranagra/redis,oranagra/redis,soloestoy/redis,ctripcorp/redis,yossigo/redis,soloestoy/redis,ofirluzon/redis,soloestoy/redis,pmem/redis,charsyam/redis,soloestoy/redis,neomantra/redis