Fix return types from boolean/false to pointer/NULL.

inc/crn_decomp.h

@@ -2823,15 +2823,15 @@ namespace crnd
          *pSize = 0;
 
       if ((!pData) || (data_size < cCRNHeaderMinSize))
-         return false;
+         return NULL;
 
       crn_header tmp_header;
       const crn_header* pHeader = crnd_get_header(tmp_header, pData, data_size);
       if (!pHeader)
-         return false;
+         return NULL;
 
       if (level_index >= pHeader->m_levels)
-         return false;
+         return NULL;
 
       uint32 cur_level_ofs = pHeader->m_level_ofs[level_index];