Mark Andrews authored Feb 13, 2019 and Ondřej Surý committed Nov 05, 2019

(cherry picked from commit 4938f97c)

This commit was cherry-picked from v9_14 and it fixes the following
scan-build warnings:

tsig.c:1030:20: warning: Assigned value is garbage or undefined
                        tsig.timesigned = querytsig.timesigned;
                                        ^ ~~~~~~~~~~~~~~~~~~~~
tsig.c:1092:26: warning: The right operand of '<' is a garbage value
                        if (response && bytes < querytsig.siglen)
                                              ^ ~~~~~~~~~~~~~~~~
2 warnings generated.