rem: ignore = XMALLOC (struct ignore_pattern, 1);
add: ignore = xmalloc (sizeof *ignore);
context: add_ignore_pattern (const char *pattern){  register struct ignore_pattern *ignore;  ignore = XMALLOC (struct ignore_pattern, 1);  ignore->pattern = pattern;  /* Add it to the head of the linked list. */  ignore->next = ignore_patterns;  ignore_patterns = ignore;}