Sparse errors

[Pierre-Louis Bossart]

Hi Takashi,
Sparse reports a lot of new issues in our last checks with more options:

export ARCH=x86_64 CF="-Wsparse-error -Wsparse-all -Wno-bitwise-pointer 
-Wno-pointer-arith -Wno-typesign -Wnoshadow -Wno-sizeof-bool"
make -k sound/ C=2

most are linked to the __user and pcm_format_t restricted types, but I 
found the simpler ones below which are useless comparisons. I can send a 
patch for the last but not sure how to address the first two.

Thanks for your feedback
-Pierre

sound/core/info.c:95:38: error: self-comparison always evaluates to false

	if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
		return false;

not sure what the second comparison is meant to check?

sound/drivers/opl3/opl3_midi.c:183:60: error: self-comparison always 
evaluates to false

This indeed makes no sense. the voice_time and vp->time are not changed 
in the loop, the test is either redundant or something else is missing.

sound/pci/lx6464es/lx_core.c:677:34: error: self-comparison always 
evaluates to false

That seems like dead code indeed:

	u32 channels = runtime->channels;

	if (runtime->channels != channels)
		dev_err(chip->card->dev, "channel count mismatch: %d vs %d",
			   runtime->channels, channels);