Revert "fixup! New function mbedtls_rsa_get_bitlen"

This reverts commit c939f6fcba1cda328c4a21b7c8df596690e36add.
diff --git a/tests/suites/test_suite_pk.function b/tests/suites/test_suite_pk.function
index 916b3c5..a1d9b0b 100644
--- a/tests/suites/test_suite_pk.function
+++ b/tests/suites/test_suite_pk.function
@@ -16,7 +16,6 @@
 static int pk_genkey( mbedtls_pk_context *pk, int size )
 {
     ((void) pk);
-    ((void) size);
 
 #if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_GENPRIME)
     if( mbedtls_pk_get_type( pk ) == MBEDTLS_PK_RSA )