fix various issues

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 9ffd078..b708406 100644
--- a/library/ssl_tls13_generic.c
+++ b/library/ssl_tls13_generic.c
@@ -284,12 +284,12 @@
 }
 
 static int ssl_tls13_sig_alg_is_offered( const mbedtls_ssl_context *ssl,
-                                         uint16_t received_sig_alg )
+                                         uint16_t proposed_sig_alg )
 {
     for( const uint16_t *sig_alg = mbedtls_ssl_conf_get_sig_algs( ssl->conf );
          *sig_alg != MBEDTLS_TLS1_3_SIG_NONE; sig_alg++ )
     {
-        if( *sig_alg == received_sig_alg )
+        if( *sig_alg == proposed_sig_alg )
             return( 1 );
     }
     return( 0 );