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1.nvmf: change the return type of calloc failed to -ENOMEM and keep consistency in this file. 2.thread: revise rc condition to ( rc!= 0),to deal with all abnormal return. Change-Id: I7cccb548f30448eaa1bac1a5904c3edcad9c1208 Signed-off-by: yidong0635 <dongx.yi@intel.com> Reviewed-on: https://review.gerrithub.io/431459 Chandler-Test-Pool: SPDK Automated Test System <sys_sgsw@intel.com> Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Reviewed-by: Ben Walker <benjamin.walker@intel.com> Reviewed-by: Jim Harris <james.r.harris@intel.com>