astFreeastFree - Free previously allocated memory

Description:

This function frees memory that has previouly been dynamically allocated using one of the AST memory function.

Synopsis:

void $*$astFree( void $*$ptr )

Parameters:

ptr

Pointer to previously allocated memory. An error will result if the memory has not previously been allocated by another function in this module. However, a NULL pointer value is accepted (without error) as indicating that no memory has yet been allocated, so that no action is required.

Returned Value:

astFree()

Always returns a NULL pointer.