Remove empty #if #endif block

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/library/ssl_misc.h b/library/ssl_misc.h
index 2085e2d..8c2ad47 100644
--- a/library/ssl_misc.h
+++ b/library/ssl_misc.h
@@ -1458,9 +1458,6 @@
                                        unsigned hs_type,
                                        size_t total_hs_len);
 
-#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
-#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
-
 #if defined(MBEDTLS_SSL_HANDSHAKE_WITH_PSK_ENABLED)
 #if defined(MBEDTLS_SSL_CLI_C) || defined(MBEDTLS_SSL_SRV_C)
 MBEDTLS_CHECK_RETURN_CRITICAL