Fix documentation issues found by Clang
diff --git a/include/polarssl/pkcs5.h b/include/polarssl/pkcs5.h
index b8c742e..f83c8cd 100644
--- a/include/polarssl/pkcs5.h
+++ b/include/polarssl/pkcs5.h
@@ -77,7 +77,7 @@
* \param pbe_params the ASN.1 algorithm parameters
* \param mode either PKCS5_DECRYPT or PKCS5_ENCRYPT
* \param pwd password to use when generating key
- * \param plen length of password
+ * \param pwdlen length of password
* \param data data to process
* \param datalen length of data
* \param output output buffer