checksrc: find bad indentation in conditions without open brace

If the previous line starts with if/while/for AND ends with a closed
parenthesis and there's an equal number of open and closed parentheses
on that line, verify that this line is indented $indent more steps, if
not a cpp line.

Also adjust the fall-out from this fix.

Closes #11054

lib/vtls/sectransp.c

@@ -1548,7 +1548,7 @@ static CURLcode sectransp_set_selected_ciphers(struct Curl_easy *data,
 
     /* Skip separators */
     while(is_separator(*cipher_start))
-       cipher_start++;
+      cipher_start++;
     if(*cipher_start == '\0') {
       break;
     }