Bug 1579036 - Define error when trying to export non-existent cert wi…

…th pk12util. r=jcj

Differential Revision: https://phabricator.services.mozilla.com/D45452

--HG--
extra : moz-landing-system : lando

cmd/pk12util/pk12util.c

@@ -644,6 +644,7 @@ P12U_ExportPKCS12Object(char *nn, char *outfile, PK11SlotInfo *inSlot,
     }
     certlist = PK11_FindCertsFromNickname(nn, slotPw);
     if (!certlist) {
+        PORT_SetError(SEC_ERROR_UNKNOWN_CERT);
         SECU_PrintError(progName, "find user certs from nickname failed");
         pk12uErrno = PK12UERR_FINDCERTBYNN;
         return;