af_resample: Set the number of samples in the last frame

Otherwise trailing zeroes would appear.
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

libavfilter/af_resample.c

@@ -202,6 +202,7 @@ static int request_frame(AVFilterLink *outlink)
             return (ret == 0) ? AVERROR_EOF : ret;
         }
 
+        frame->nb_samples = ret;
         frame->pts = s->next_pts;
         return ff_filter_frame(outlink, frame);
     }

tests/fate/libavresample.mak

@@ -38,7 +38,7 @@ fate-lavr-resample-$(3)-$(1)-$(2): CMD = avconv -i $(TARGET_PATH)/tests/data/asy
 fate-lavr-resample-$(3)-$(1)-$(2): CMP = oneoff
 fate-lavr-resample-$(3)-$(1)-$(2): CMP_UNIT = $(5)
 fate-lavr-resample-$(3)-$(1)-$(2): FUZZ = 6
-fate-lavr-resample-$(3)-$(1)-$(2): REF = $(SAMPLES)/lavr/lavr-resample-$(3)-$(1)-$(2)-v2
+fate-lavr-resample-$(3)-$(1)-$(2): REF = $(SAMPLES)/lavr/lavr-resample-$(3)-$(1)-$(2)-v3
 endef
 
 $(call CROSS_TEST,$(SAMPLERATES),RESAMPLE,s16p,s16le,s16)