Revert "Incorporate new prefilter_params"

This reverts commit 5cb3c16.

Author: lshaw8317

src/blosc2/blosc2_ext.pyx

@@ -26,7 +26,7 @@ from cpython cimport (
 from cpython.pycapsule cimport PyCapsule_GetPointer, PyCapsule_New
 from cython.operator cimport dereference
 from libc.stdint cimport uintptr_t
-from libc.stdlib cimport free, malloc, realloc, calloc
+from libc.stdlib cimport free, malloc, realloc
 from libc.stdlib cimport abs as c_abs
 from libc.string cimport memcpy, strcpy, strdup, strlen
 from libcpp cimport bool as c_bool
@@ -206,7 +206,6 @@ cdef extern from "blosc2.h":
         uint8_t* ttmp
         size_t ttmp_nbytes
         blosc2_context* ctx
-        c_bool output_is_disposable
 
     ctypedef struct blosc2_postfilter_params:
         void *user_data
@@ -1619,7 +1618,7 @@ cdef class SChunk:
         cdef blosc2_cparams* cparams = self.schunk.storage.cparams
         cparams.prefilter = <blosc2_prefilter_fn> general_filler
 
-        cdef blosc2_prefilter_params* preparams = <blosc2_prefilter_params *> calloc(1, sizeof(blosc2_prefilter_params))
+        cdef blosc2_prefilter_params* preparams = <blosc2_prefilter_params *> malloc(sizeof(blosc2_prefilter_params))
         cdef filler_udata* fill_udata = <filler_udata *> malloc(sizeof(filler_udata))
         fill_udata.py_func = <char *> malloc(strlen(func_id) + 1)
         strcpy(fill_udata.py_func, func_id)
@@ -1652,7 +1651,7 @@ cdef class SChunk:
 
         cdef blosc2_cparams* cparams = self.schunk.storage.cparams
         cparams.prefilter = <blosc2_prefilter_fn> general_prefilter
-        cdef blosc2_prefilter_params* preparams = <blosc2_prefilter_params *> calloc(1, sizeof(blosc2_prefilter_params))
+        cdef blosc2_prefilter_params* preparams = <blosc2_prefilter_params *> malloc(sizeof(blosc2_prefilter_params))
         cdef user_filters_udata* pref_udata = <user_filters_udata*> malloc(sizeof(user_filters_udata))
         pref_udata.py_func = <char *> malloc(strlen(func_id) + 1)
         strcpy(pref_udata.py_func, func_id)