pem_read_buffer() already update use_len after header and footer are read
After header and footer are read, pem_read_buffer() is able to determine
the length of input data used. This allows calling functions to skip
this PEM bit if an error occurs during its parsing.
diff --git a/include/polarssl/error.h b/include/polarssl/error.h
index 093bec1..73ebe89 100644
--- a/include/polarssl/error.h
+++ b/include/polarssl/error.h
@@ -73,7 +73,7 @@
*
* High-level module nr (3 bits - 0x1...-0x8...)
* Name ID Nr of Errors
- * PEM 1 8
+ * PEM 1 9
* X509 2 21
* DHM 3 6
* RSA 4 9