config_setting_lookup: documentation does not match code

[georeth]

in the doc, the signature of config_setting_lookup is:

config_setting_t *config_setting_lookup(const config_setting_t *setting, const char *path)

this is problematic, since it can return its argument directly. thus, the const qualifier is removed. and i expect it does not change the config_setting_t since the argument is const.

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in the code, the signature is:

config_setting_t *config_setting_lookup(config_setting_t *setting, const char *path)

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I think the right way is providing both a mutable version and a const version:

const config_setting_t *config_setting_lookup_const(const config_setting_t *setting, const char *path)
config_setting_t *config_setting_lookup(config_setting_t *setting, const char *path)

In my application, i passes const config_setting_t * to do some initialization without change the config, so I want a const version.

[hyperrealm]

Fixed in cca09fa1115512fd7b68a170e18c20d0843e8066