NO-JIRA: [c] minor fix for sanitizer warning
NO-JIRA: [c] minor fix for sanitizer warning

ssorj/qpid-proton,kgiusti/qpid-proton,alanconway/qpid-proton,ChugR/qpid-proton,apache/qpid-proton,kgiusti/qpid-proton,alanconway/qpid-proton,astitcher/qpid-proton,ssorj/qpid-proton,ChugR/qpid-proton,astitcher/qpid-proton,astitcher/qpid-proton,kgiusti/qpid-proton,astitcher/qpid-proton,gemmellr/qpid-proton,alanconway/qpid-proton,kgiusti/qpid-proton,ssorj/qpid-proton,kgiusti/qpid-proton,ChugR/qpid-proton,ssorj/qpid-proton,ssorj/qpid-proton,apache/qpid-proton,gemmellr/qpid-proton,gemmellr/qpid-proton,apache/qpid-proton,ChugR/qpid-proton,ChugR/qpid-proton,ChugR/qpid-proton,astitcher/qpid-proton,gemmellr/qpid-proton,apache/qpid-proton,ssorj/qpid-proton,astitcher/qpid-proton,gemmellr/qpid-proton,alanconway/qpid-proton,alanconway/qpid-proton,apache/qpid-proton,kgiusti/qpid-proton,apache/qpid-proton,alanconway/qpid-proton,gemmellr/qpid-proton