remove unnecessary check

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/ssl_tls13_generic.c b/library/ssl_tls13_generic.c
index 901e3c0..202f363 100644
--- a/library/ssl_tls13_generic.c
+++ b/library/ssl_tls13_generic.c
@@ -935,12 +935,6 @@
     *algorithm = MBEDTLS_TLS1_3_SIG_NONE;
     for( ; *sig_alg != MBEDTLS_TLS1_3_SIG_NONE ; sig_alg++ )
     {
-        if( *sig_alg == MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA256 ||
-            *sig_alg == MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA384 ||
-            *sig_alg == MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA512 )
-        {
-            continue;
-        }
         if( mbedtls_ssl_sig_alg_is_supported( ssl, *sig_alg) &&
             mbedtls_ssl_tls13_check_sig_alg_cert_key_match(
                                                         *sig_alg, own_key ) )