Could be (probably spurious) but for the sake of clean build output it'd be nice to fix them:
omcache.c:1021:33: warning: missing field 'key' initializer [-Wmissing-field-initializers]
omcache_value_t value = {0};
^
omcache.c:1539:29: warning: missing field 'key' initializer [-Wmissing-field-initializers]
omcache_value_t value = {0};