libldac-dec: fix decoder initialization failure

`ldacBT_init_handle_decode` passes `hLdacBT->cci`, `hLdacBT->frmlen`,
and `hLdacBT->frm_status` to `ldaclib_set_config_info()` before they
are assigned, causing `LDACBT_ERR_FATAL` on every decode init.

This breaks PipeWire 1.6+'s LDAC codec entirely, since the SPA plugin
treats decoder init failure as fatal and refuses to initialize the
encoder too.

Move the struct member assignments before the function call that uses
them.

pkgs/by-name/li/libldac-dec/fix-decode-init.patch

@@ -0,0 +1,24 @@
+--- a/src/ldacBT_api.o.c
++++ b/src/ldacBT_api.o.c
+@@ -165,6 +165,10 @@
+   // tbl_ldacbt_config[0].frmlen_1ch;
+   // frmlen = 165 * channel - LDACBT_FRMHDRBYTES;
+   frmlen = tbl_ldacbt_config[0].frmlen_1ch * channel - LDACBT_FRMHDRBYTES;
++  hLdacBT->frmlen = frmlen;
++  hLdacBT->cm = cm;
++  hLdacBT->cci = cci;
++  hLdacBT->frm_status = 0;
+   /* Set Configuration Information */
+   result = ldaclib_set_config_info(
+       hLdacBT->hLDAC, hLdacBT->sfid, hLdacBT->cci, hLdacBT->frmlen, hLdacBT->frm_status);
+@@ -174,10 +178,6 @@
+   } else if (result != LDAC_S_OK) {
+     hLdacBT->error_code_api = LDACBT_GET_LDACLIB_ERROR_CODE;
+   }
+-  hLdacBT->frmlen = frmlen;
+-  hLdacBT->cm = cm;
+-  hLdacBT->cci = cci;
+-  hLdacBT->frm_status = 0;
+   hLdacBT->sfid = sfid;
+   result = ldaclib_init_decode(hLdacBT->hLDAC, nshift);
+   if (LDAC_FAILED(result)) {

pkgs/by-name/li/libldac-dec/package.nix

@@ -17,6 +17,11 @@ stdenv.mkDerivation {
     hash = "sha256-pdeEtQXxL2pd9qTfLOEmPDn3POgo5qxRqbK807WN98s=";
   };
 
+  patches = [
+    # Fix uninitialized struct members passed to ldaclib_set_config_info in decode init
+    ./fix-decode-init.patch
+  ];
+
   nativeBuildInputs = [ cmake ];
 
   # Upstream CMakeLists.txt doesn't have install rules