run: fix error log parsing

Author: cirosantilli

run

@@ -398,13 +398,13 @@ def main(args, extra_args=None):
         with open(common.termout_file, 'br') as logfile:
             for line in logfile:
                 if panic_re.search(line):
-                    error_string_found = true
+                    error_string_found = True
         with open(common.guest_terminal_file, 'br') as logfile:
             lines = logfile.readlines()
             if lines:
                 last_line = lines[-1]
                 if last_line.rstrip() == common.magic_fail_string:
-                    error_string_found = true
+                    error_string_found = True
         if error_string_found:
             common.log_error('simulation error detected by parsing logs')
             return 1