Fix warnings reported by covscan

[Cropi]

I've executed covscan analysis on the librelp component, which detected a list of potential defects. I was able to fix most of them but the 3rd warning seems like a false positive to me. Let me know if there is a way to make such a warning disappear.

Error: BUFFER_SIZE (CWE-170): [#def1]

librelp-1.9.0/src/offers.c:221: buffer_size_warning: Calling "strncpy" with a maximum size argument of 256 bytes on destination array "pThis->szVal" of size 256 bytes might leave the destination string unterminated.
#  219|         pThis->intVal = intVal;
#  220|     } else {
#  221|->       strncpy((char*)pThis->szVal, (char*)pszVal, sizeof(pThis->szVal));
#  222|         /* check if the string actually is an integer... */
#  223|         Val = 0;

Error: BUFFER_SIZE (CWE-170): [#def2]

librelp-1.9.0/src/offers.c:266: buffer_size_warning: Calling "strncpy" with a maximum size argument of 33 bytes on destination array "pThis->szName" of size 33 bytes might leave the destination string unterminated.
#  264|   
#  265|     CHKRet(relpOfferConstruct(&pThis, pOffers->pEngine));
#  266|->   strncpy((char*)pThis->szName, (char*)pszName, sizeof(pThis->szName));
#  267|     pThis->pNext = pOffers->pRoot;
#  268|     pOffers->pRoot = pThis;

Error: RESOURCE_LEAK (CWE-772): [#def3]

librelp-1.9.0/src/relpsrv.c:409: alloc_arg: "relpTcpConstruct" allocates memory that is stored into "pTcp".
librelp-1.9.0/src/relpsrv.c:410: noescape: Resource "pTcp" is not freed or pointed-to in "relpTcpSetUsrPtr".
librelp-1.9.0/src/relpsrv.c:412: noescape: Resource "pTcp" is not freed or pointed-to in "relpTcpEnableTLS".
librelp-1.9.0/src/relpsrv.c:414: noescape: Resource "pTcp" is not freed or pointed-to in "relpTcpEnableTLSZip".
librelp-1.9.0/src/relpsrv.c:416: noescape: Resource "pTcp" is not freed or pointed-to in "relpTcpSetDHBits".
librelp-1.9.0/src/relpsrv.c:417: noescape: Resource "pTcp" is not freed or pointed-to in "relpTcpSetGnuTLSPriString".
librelp-1.9.0/src/relpsrv.c:418: noescape: Resource "pTcp" is not freed or pointed-to in "relpTcpSetTlsConfigCmd".
librelp-1.9.0/src/relpsrv.c:419: noescape: Resource "pTcp" is not freed or pointed-to in "relpTcpSetAuthMode".
librelp-1.9.0/src/relpsrv.c:420: noescape: Resource "pTcp" is not freed or pointed-to in "relpTcpSetCACert".
librelp-1.9.0/src/relpsrv.c:421: noescape: Resource "pTcp" is not freed or pointed-to in "relpTcpSetOwnCert".
librelp-1.9.0/src/relpsrv.c:422: noescape: Resource "pTcp" is not freed or pointed-to in "relpTcpSetPrivKey".
librelp-1.9.0/src/relpsrv.c:423: noescape: Resource "pTcp" is not freed or pointed-to in "relpTcpSetPermittedPeers".
librelp-1.9.0/src/relpsrv.c:438: leaked_storage: Variable "pTcp" going out of scope leaks the storage it points to.
#  436|     }
#  437|   
#  438|->   LEAVE_RELPFUNC;
#  439|   }

Error: BUFFER_SIZE (CWE-120): [#def4]

librelp-1.9.0/src/tcp.c:2384: buffer_size: Calling "strncpy" with a source string whose length (4 chars) is greater than or equal to the size argument (4) will fail to null-terminate "fpBuf".
# 2382|     if (sizeTotal <bufLen)
# 2383|     {
# 2384|->       strncpy(fpBuf,digestType,sizeDigest);
# 2385|         iDst=sizeDigest;
# 2386|         for(iSrc = 0; iSrc < sizeFingerprint ; ++iSrc, iDst += 3) {