really clear the error queue here

PR: 860

ssl/ssl_rsa.c

@@ -804,7 +804,7 @@ int SSL_CTX_use_certificate_chain_file(SSL_CTX *ctx, const char *file)
 		/* When the while loop ends, it's usually just EOF. */
 		err = ERR_peek_last_error();
 		if (ERR_GET_LIB(err) == ERR_LIB_PEM && ERR_GET_REASON(err) == PEM_R_NO_START_LINE)
-			(void)ERR_get_error();
+			ERR_clear_error();
 		else 
 			ret = 0; /* some real error */
 		}