py/runtime: Mark m_malloc_fail() as NORETURN.

Author: dpgeorge

py/misc.h

@@ -92,7 +92,7 @@ void *m_realloc(void *ptr, size_t new_num_bytes);
 void *m_realloc_maybe(void *ptr, size_t new_num_bytes, bool allow_move);
 void m_free(void *ptr);
 #endif
-void *m_malloc_fail(size_t num_bytes);
+NORETURN void *m_malloc_fail(size_t num_bytes);
 
 #if MICROPY_MEM_STATS
 size_t m_get_total_bytes_allocated(void);

py/runtime.c

@@ -1408,7 +1408,7 @@ mp_obj_t mp_parse_compile_execute(mp_lexer_t *lex, mp_parse_input_kind_t parse_i
 
 #endif // MICROPY_ENABLE_COMPILER
 
-void *m_malloc_fail(size_t num_bytes) {
+NORETURN void *m_malloc_fail(size_t num_bytes) {
  DEBUG_printf("memory allocation failed, allocating %u bytes\n", (uint)num_bytes);
  if (0) {
  // dummy