arch/powerpc/platforms/pseries/papr-hvpipe.c:121:24: sparse: sparse: incorrect type in return expression (different base types)

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   94515f3a7d4256a5062176b7d6ed0471938cd51a
commit: 814ef095f12c9fa142043ee689500f3a41bb6dab powerpc/pseries: Add papr-hvpipe char driver for HVPIPE interfaces
date:   10 months ago
config: powerpc64-randconfig-r122-20260719 (https://download.01.org/0day-ci/archive/20260719/202607191622.5ceVzb9r-lkp@xxxxxxxxx/config)
compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project 5c0dfced1adc55429e32b1db08570abd3a219d85)
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260719/202607191622.5ceVzb9r-lkp@xxxxxxxxx/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
| Fixes: 814ef095f12c ("powerpc/pseries: Add papr-hvpipe char driver for HVPIPE interfaces")
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202607191622.5ceVzb9r-lkp@xxxxxxxxx/

sparse warnings: (new ones prefixed by >>)
>> arch/powerpc/platforms/pseries/papr-hvpipe.c:121:24: sparse: sparse: incorrect type in return expression (different base types) @@     expected restricted __poll_t @@     got int @@
   arch/powerpc/platforms/pseries/papr-hvpipe.c:121:24: sparse:     expected restricted __poll_t
   arch/powerpc/platforms/pseries/papr-hvpipe.c:121:24: sparse:     got int

vim +121 arch/powerpc/platforms/pseries/papr-hvpipe.c

   108	
   109	/*
   110	 * The user space waits for the payload to receive.
   111	 * The hypervisor sends HVPIPE event message to the partition
   112	 * when the payload is available. The event handler wakeup FD
   113	 * depends on the source ID in the message event.
   114	 */
   115	static __poll_t papr_hvpipe_handle_poll(struct file *filp,
   116			struct poll_table_struct *wait)
   117	{
   118		struct hvpipe_source_info *src_info = filp->private_data;
   119	
   120		if (!src_info)
 > 121			return POLLNVAL;
   122	
   123		return 0;
   124	}
   125	

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