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.
(cherry picked from commit 9255e8300e550b548b54603c77585921f442e391)
diff --git a/include/polarssl/error.h b/include/polarssl/error.h
index 728b29e..cb8840c 100644
--- a/include/polarssl/error.h
+++ b/include/polarssl/error.h
@@ -75,7 +75,7 @@
*
* 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