misra.py: strip error message so it does not end with \r

addons/misra.py

@@ -4063,7 +4063,7 @@ class MisraChecker:
                 if self.path_premium_addon:
                     for line in cppcheckdata.cmd_output([self.path_premium_addon, '--cli', '--get-rule-text=' + errorId]).split('\n'):
                         if len(line) > 1 and not line.startswith('{'):
-                            errmsg = line
+                            errmsg = line.strip()
                             break
             else:
                 errmsg = 'misra violation %s with no text in the supplied rule-texts-file' % (ruleNum)