doxygen: rawmidi: silence 'not documented' warnings

From: borine@github
Link: https://github.com/alsa-project/alsa-lib/pull/340
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

src/rawmidi/ump.c

@@ -674,6 +674,7 @@ const char *snd_ump_block_info_get_name(const snd_ump_block_info_t *info)
 
 /**
  * \brief get UMP block information
+ * \param ump UMP handle
  * \param info pointer to a snd_ump_block_info_t structure
  * \return 0 on success otherwise a negative error code
  *

src/rawmidi/ump_local.h

@@ -3,8 +3,10 @@
 #include "ump.h"
 #include "ump_msg.h"
 
+#ifndef DOC_HIDDEN
 struct _snd_ump {
 	snd_rawmidi_t *rawmidi;
 	unsigned int flags;
 	int is_input;
 };
+#endif /* DOC_HIDDEN */