Comply with mbedtls naming rules

Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
diff --git a/library/ssl_cli.c b/library/ssl_cli.c
index 50bc5e3..a15bb30 100644
--- a/library/ssl_cli.c
+++ b/library/ssl_cli.c
@@ -1792,7 +1792,7 @@
 static int ssl_parse_use_srtp_ext( mbedtls_ssl_context *ssl,
                                const unsigned char *buf, size_t len )
 {
-    enum mbedtls_DTLS_SRTP_protection_profiles server_protection = MBEDTLS_SRTP_UNSET_PROFILE;
+    mbedtls_dtls_srtp_protection_profiles server_protection = MBEDTLS_SRTP_UNSET_PROFILE;
     size_t i;
     uint16_t server_protection_profile_value = 0;