Fix a warning about possibly unused variable

xtrabackup_init_temp_log(): Remove a redundant variable and limit scope.

Author: dr-m

extra/mariabackup/xtrabackup.cc

@@ -4246,16 +4246,11 @@ xtrabackup_init_temp_log(void)
 
 ib_int64_tfile_size;
 
-lsn_tmax_no;
-lsn_tmax_lsn;
-lsn_tcheckpoint_no;
+lsn_tmax_no	= 0;
+lsn_tmax_lsn	= 0;
 
 ulint	fold;
 
-boolcheckpoint_found;
-
-max_no = 0;
-
 if (!log_buf) {
 goto error;
 }
@@ -4354,35 +4349,29 @@ xtrabackup_init_temp_log(void)
 //' ', 4);
 }
 
-checkpoint_found = false;
-
 /* read last checkpoint lsn */
 for (field = LOG_CHECKPOINT_1; field <= LOG_CHECKPOINT_2;
 field += LOG_CHECKPOINT_2 - LOG_CHECKPOINT_1) {
 if (!recv_check_cp_is_consistent(const_cast<const byte *>
  (log_buf + field)))
-goto not_consistent;
+continue;
 
-checkpoint_no = mach_read_from_8(log_buf + field +
- LOG_CHECKPOINT_NO);
+lsn_t checkpoint_no = mach_read_from_8(log_buf + field +
+  LOG_CHECKPOINT_NO);
 
 if (checkpoint_no >= max_no) {
 
 max_no = checkpoint_no;
 max_lsn = mach_read_from_8(log_buf + field +
  LOG_CHECKPOINT_LSN);
-checkpoint_found = true;
 }
-not_consistent:
-;
 }
 
-if (!checkpoint_found) {
+if (!max_lsn) {
 msg("mariabackup: No valid checkpoint found.\n");
 goto error;
 }
 
-
 /* It seems to be needed to overwrite the both checkpoint area. */
 mach_write_to_8(log_buf + LOG_CHECKPOINT_1 + LOG_CHECKPOINT_LSN,
 max_lsn);