Fix arity of the PARAM_FAILED() macro and function

It was inconsistent between files: sometimes 3 arguments, sometimes one.

Align to 1 argument for the macro and 3 for the function, because:
- we don't need 3 arguments for the macro, it can add __FILE__ and __LINE__
  in its expansion, while the function needs them as parameters to be correct;
- people who re-defined the macro should have flexibility, and 3 arguments
  can give the impression they they don't have as much as they actually do;
- the design document has the macro with 1 argument, so let's stick to that.

include/mbedtls/platform_util.h

@@ -42,8 +42,8 @@ extern "C" {
 #endif
 
 #if defined( MBEDTLS_CHECK_PARAMS ) && !defined(MBEDTLS_PARAM_FAILED)
-#define MBEDTLS_PARAM_FAILED( cond, file, line )                               \
-                                        mbedtls_param_failed( cond, file, line )
+#define MBEDTLS_PARAM_FAILED( cond ) \
+    mbedtls_param_failed( cond, __FILE__, __LINE__ )
 
 /**
  * \brief       User supplied callback function for parameter validation failure.
@@ -65,7 +65,6 @@ extern "C" {
  *              execution in the application code.
  */
 void mbedtls_param_failed( char* failure_condition, char* file, int line );
-
 #endif /* MBEDTLS_CHECK_PARAMS && !MBEDTLS_PARAM_FAILED */
 
 /**