intel/fs: roll the loop with the <0,1,0> additions in emit_scan()

intel/fs: roll the loop with the <0,1,0> additions in emit_scan()

IMHO the code is easier to understand this way, being explicit that
we're doing exactly the same thing every time.

No functional changes.

v2: Adjust the loop breaking condition (Jason).

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>