Only check for warnings produced by mysqltest if --check-testcases

mysql-test/lib/mtr_report.pl

@@ -296,6 +296,8 @@ sub mtr_report_stats ($) {
         }
       }
 
+      if ( $::opt_check_testcases )
+      {
         # Look for warnings produced by mysqltest in testname.warnings
         foreach my $test_warning_file
 	  ( glob("$::glob_mysql_test_dir/r/*.warnings") )
@@ -303,6 +305,7 @@ sub mtr_report_stats ($) {
           $found_problems= 1;
 	  print WARN "Check myqltest warnings in $test_warning_file\n";
         }
+      }
 
       if ( $found_problems )
       {