m_config, command: remove some minor code duplication

I would have been fine with this, but now I want to add another flag,
and the duplication would become more messy than having a strange
function for deduplication.

options/m_config.c

@@ -676,6 +676,12 @@ static int handle_set_opt_flags(struct m_config *config,
     return set ? 2 : 1;
 }
 
+void m_config_mark_co_flags(struct m_config_option *co, int flags)
+{
+    if (flags & M_SETOPT_FROM_CMDLINE)
+        co->is_set_from_cmdline = true;
+}
+
 // Unlike m_config_set_option_raw() this does not go through the property layer
 // via config.option_set_callback.
 int m_config_set_option_raw_direct(struct m_config *config,
@@ -696,9 +702,7 @@ int m_config_set_option_raw_direct(struct m_config *config,
 
     m_option_copy(co->opt, co->data, data);
 
-    if (flags & M_SETOPT_FROM_CMDLINE)
-        co->is_set_from_cmdline = true;
-
+    m_config_mark_co_flags(co, flags);
     m_config_notify_change_co(config, co);
 
     return 0;

options/m_config.h

@@ -184,6 +184,8 @@ static inline int m_config_set_option0(struct m_config *config,
 int m_config_set_option_raw(struct m_config *config, struct m_config_option *co,
                             void *data, int flags);
 
+void m_config_mark_co_flags(struct m_config_option *co, int flags);
+
 int m_config_set_option_raw_direct(struct m_config *config,
                                    struct m_config_option *co,
                                    void *data, int flags);

player/command.c

@@ -320,9 +320,8 @@ int mp_on_set_option(void *ctx, struct m_config_option *co, void *data, int flag
     if (r != M_PROPERTY_OK)
         return M_OPT_INVALID;
 
-    // The flag can't be passed through the property layer correctly.
-    if (flags & M_SETOPT_FROM_CMDLINE)
-        co->is_set_from_cmdline = true;
+    // The flags can't be passed through the property layer correctly.
+    m_config_mark_co_flags(co, flags);
 
     return 0;