Fix a typo in a comment
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 3971fd7..5960f3d 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -11621,7 +11621,7 @@
/*
* The context should have been freshly setup or reset.
* Give the user an error in case of obvious misuse.
- * (Checking session is useful because if won't be NULL if we're
+ * (Checking session is useful because it won't be NULL if we're
* renegotiating, or if the user mistakenly loaded a session first.)
*/
if( ssl->state != MBEDTLS_SSL_HELLO_REQUEST ||