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fix where fade is configured to truncate only

--- a/src/fade.c

+++ b/src/fade.c

@@ -114,6 +114,7 @@

 static int sox_fade_start(sox_effect_t * effp)

 {

     priv_t * fade = (priv_t *) effp->priv;

+    sox_bool truncate = sox_false;

     /* converting time values to samples */

     fade->in_start = 0;

@@ -130,7 +131,7 @@

                             &fade->out_stop, 't') == NULL)

           return lsx_usage(effp);

-        if (!fade->out_stop) {

+        if (!(truncate = !!fade->out_stop)) {

           fade->out_stop = effp->in_signal.length / effp->in_signal.channels;

           if (!fade->out_stop) {

             lsx_fail("cannot fade out: audio length is neither known nor given");

@@ -173,7 +174,8 @@

     lsx_debug("fade: in_start = %lu in_stop = %lu out_start = %lu out_stop = %lu", (unsigned long)fade->in_start, (unsigned long)fade->in_stop, (unsigned long)fade->out_start, (unsigned long)fade->out_stop);

-    if (fade->in_start == fade->in_stop && fade->out_start == fade->out_stop)

+    if (fade->in_start == fade->in_stop && !truncate &&

+        fade->out_start == fade->out_stop)

       return SOX_EFF_NULL;

     return SOX_SUCCESS;