MDEV-10056: SST method mysqldump is broken

errno must be reset before strtol()/strtoll() functions
are invoked.

sql/wsrep_sst.cc

@@ -340,6 +340,7 @@ static int sst_scan_uuid_seqno (const char* str,
                                 wsrep_uuid_t* uuid, wsrep_seqno_t* seqno)
 {
   int offt = wsrep_uuid_scan (str, strlen(str), uuid);
+  errno= 0;                                     /* Reset the errno */
   if (offt > 0 && strlen(str) > (unsigned int)offt && ':' == str[offt])
   {
     *seqno = strtoll (str + offt + 1, NULL, 10);

sql/wsrep_utils.h

@@ -155,6 +155,7 @@ private:
   }
 
   bool parse_port(const char *port) {
+    errno= 0;                                   /* Reset the errno */
     m_port= strtol(port, NULL, 10);
     if (errno == EINVAL || errno == ERANGE)
     {