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[effects] remove asserts from aubio_split_str

--- a/src/effects/rubberband_utils.c

+++ b/src/effects/rubberband_utils.c

@@ -17,7 +17,6 @@

 #include <stdio.h>

 #include <stdlib.h>

 #include <string.h>

-#include <assert.h>

 char_t** aubio_split_str(const char_t* str, const char_t sep) {

   char_t** result = 0;

@@ -44,17 +43,18 @@

   result = AUBIO_ARRAY(char_t*, count);

   if (result) {

-    uint_t idx  = 0;

+    uint_t idx = 0;

     char_t* params = strtok(input, delim);

     while (params) {

       // make sure we don't got in the wild

-      assert(idx < count);

+      if (idx >= count)

+        break;

       *(result + idx++) = strdup(params);

       params = strtok(0, delim);

     }

-    assert(idx == count - 1);

-    // add null string at the end

-    *(result + idx) = 0;

+    // add null string at the end if needed

+    if (idx < count - 1)

+      *(result + idx) = 0;

   }

   return result;

 }