Update Python/bltinmodule.c to use PEP-7

Co-authored-by: Stan Ulbrych <stan@python.org>

Author: Virv12

Python/bltinmodule.c

@@ -2587,7 +2587,10 @@ builtin_input_impl(PyObject *module, PyObject *prompt)
             }
             else {
                 if (s[len-1] == '\n')
-                    len--;   /* strip trailing '\n' */
+                /* strip trailing '\n' */
+                if (s[len-1] == '\n') {
+                    len--;
+                }
                 if (len != 0 && s[len-1] == '\r')
                     len--;   /* strip trailing '\r' */
                 result = PyUnicode_Decode(s, len, stdin_encoding_str,