I agree with you in principal, but in practice I work on a lot of C code that does not have a built in bool type (C89).

In your example using > or < there is not an issue because it's certain the return value is either 0 or 1. However, when checking a specific variable used as a boolean I prefer to see an explicit comparison.

if(variable)

versus

if(variable==TRUE)

I developed this preference after spending weeks on a particularly nasty bug. The bug was triggered by a corrupted int that was used as a boolean variable that passed a check because if(146134613) { kill_me_now(); } will run, even though the value had been corrupted. (of course, tracking down the source of the corruption was the real fix for that case, but there's no point in having safety checks that don't work)