[tiwai-sound:for-next 9/10] sound/core/ump.c:694:6: warning: variable 'type' is uninitialized when used here

[tiwai-sound:for-next 9/10] sound/core/ump.c:694:6: warning: variable 'type' is uninitialized when used here

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git for-next
head:   e472ffe6ae48ba80461ff1a7bb40f73665a856f0
commit: 42db3930d4d7384d4e241c928e8cb2a0cdc5589c [9/10] ALSA: ump: Don't accept an invalid UMP protocol number
config: i386-randconfig-011-20240529 (https://download.01.org/0day-ci/archive/20240530/202405300035.Fz3pTUG4-lkp@intel.com/config)
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240530/202405300035.Fz3pTUG4-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202405300035.Fz3pTUG4-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> sound/core/ump.c:694:6: warning: variable 'type' is uninitialized when used here [-Wuninitialized]
     694 |         if (type != SNDRV_UMP_EP_INFO_PROTO_MIDI1 &&
         |             ^~~~
   sound/core/ump.c:688:19: note: initialize the variable 'type' to silence this warning
     688 |         unsigned int type;
         |                          ^
         |                           = 0
   1 warning generated.


vim +/type +694 sound/core/ump.c

   678	
   679	/**
   680	 * snd_ump_switch_protocol - switch MIDI protocol
   681	 * @ump: UMP endpoint
   682	 * @protocol: protocol to switch to
   683	 *
   684	 * Returns 1 if the protocol is actually switched, 0 if unchanged
   685	 */
   686	int snd_ump_switch_protocol(struct snd_ump_endpoint *ump, unsigned int protocol)
   687	{
   688		unsigned int type;
   689	
   690		protocol &= ump->info.protocol_caps;
   691		if (protocol == ump->info.protocol)
   692			return 0;
   693	
 > 694		if (type != SNDRV_UMP_EP_INFO_PROTO_MIDI1 &&
   695		    type != SNDRV_UMP_EP_INFO_PROTO_MIDI2)
   696			return 0;
   697	
   698		ump->info.protocol = protocol;
   699		ump_dbg(ump, "New protocol = %x (caps = %x)\n",
   700			protocol, ump->info.protocol_caps);
   701		seq_notify_protocol(ump);
   702		return 1;
   703	}
   704	EXPORT_SYMBOL_GPL(snd_ump_switch_protocol);
   705	

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