Minor style improvements

Signed-off-by: Chris Jones <christopher.jones@arm.com>
diff --git a/include/mbedtls/x509_csr.h b/include/mbedtls/x509_csr.h
index 9f3cae2..07a3717 100644
--- a/include/mbedtls/x509_csr.h
+++ b/include/mbedtls/x509_csr.h
@@ -136,7 +136,7 @@
  */
 int mbedtls_x509_csr_info( char *buf, size_t size, const char *prefix,
                    const mbedtls_x509_csr *csr );
-#endif
+#endif /* !MBEDTLS_X509_REMOVE_INFO */
 
 /**
  * \brief          Initialize a CSR