signed: comparing to literals together creates a false positive

signed: comparing to literals together creates a false positive

There is a macro in the kernel is_signed_type() which does this:

#define is_signed_type(type)    (((type)(-1)) < 0)

In fact any time we compare two literals they are always going to either be
always false or always true.  So we don't need to worry about that here.

Signed-off-by: Dan Carpenter <error27@gmail.com>