rate: fix crash when input and output rates are very close [bug #334]
rate: fix crash when input and output rates are very close [bug #334]

If the rate factor is too close to 1, resampling isn't possible.
Detect this and bypass the rate effect.  This only happens if
the output rate is within about 50 ppb of the input, so it is
unlikely to occur in normal use.

uklauer/sox,uklauer/sox,uklauer/sox,uklauer/sox