Fixed bug that causes segmentation fault when erasing key which does not exist in map.

lib/spdylay_map.c

@@ -164,6 +164,7 @@ static spdylay_map_entry* erase_rotate_recur(spdylay_map_entry *entry)
 
 static spdylay_map_entry* erase_recur(spdylay_map_entry *entry, key_type key)
 {
+  if(entry != NULL) {
     if(key < entry->key) {
       entry->left = erase_recur(entry->left, key);
     } else if(key > entry->key) {
@@ -171,6 +172,7 @@ static spdylay_map_entry* erase_recur(spdylay_map_entry *entry, key_type key)
     } else {
       entry = erase_rotate_recur(entry);
     }
+  }
   return entry;
 }
 

tests/spdylay_map_test.c

@@ -47,9 +47,11 @@ void test_spdylay_map()
   spdylay_map_erase(&map, 1);
   CU_ASSERT(NULL == spdylay_map_find(&map, 1));
 
+  spdylay_map_erase(&map, 1);
+  CU_ASSERT(NULL == spdylay_map_find(&map, 1));
+
   CU_ASSERT(strcmp("bar", spdylay_map_find(&map, 2)) == 0);
   CU_ASSERT(strcmp("shrubbery", spdylay_map_find(&map, 4)) == 0);
 
   spdylay_map_free(&map);
 }
-