swresample/resample: do not assert compensation_distance on rebuild_filter

when set_compensation is called with zero sample_delta,
compensation does not happen (because dst_incr == ideal_dst_incr)
but compensation_distance is set

regression since 01ebb57c03

Found-by: wm4 <nfxjfg@googlemail.com>
Reviewed-by: wm4 <nfxjfg@googlemail.com>
Signed-off-by: Muhammad Faiz <mfcc64@gmail.com>

libswresample/resample.c

@@ -388,7 +388,7 @@ static int rebuild_filter_bank_with_compensation(ResampleContext *c)
     if (phase_count == c->phase_count)
         return 0;
 
-    av_assert0(!c->frac && !c->dst_incr_mod && !c->compensation_distance);
+    av_assert0(!c->frac && !c->dst_incr_mod);
 
     new_filter_bank = av_calloc(c->filter_alloc, (phase_count + 1) * c->felem_size);
     if (!new_filter_bank)