cpukit/libfs/src/dosfs/*: Address unused parameter warnings

Add "(void) param;" annotation to address unused parameter warnings.
Found with GCC's warning -Wunused-paramter.

cpukit/libfs/src/dosfs/fat_file.c

@@ -1036,6 +1036,8 @@ static inline void
 _hash_insert(rtems_chain_control *hash, uint32_t   key1, uint32_t   key2,
              fat_file_fd_t *el)
 {
+    (void) key2;
+
     rtems_chain_append_unprotected((hash) + ((key1) % FAT_HASH_MODULE), &(el)->link);
 }
 
@@ -1056,6 +1058,10 @@ static inline void
 _hash_delete(rtems_chain_control *hash, uint32_t   key1, uint32_t   key2,
              fat_file_fd_t *el)
 {
+    (void) hash;
+    (void) key1;
+    (void) key2;
+
     rtems_chain_extract_unprotected(&(el)->link);
 }
 

cpukit/libfs/src/dosfs/msdos_create.c

@@ -68,6 +68,8 @@ msdos_creat_node(const rtems_filesystem_location_info_t  *parent_loc,
                  mode_t                                   mode,
                  fat_file_fd_t                           *link_fd)
 {
+    (void) mode;
+
     int               rc = RC_OK;
     ssize_t           ret = 0;
     msdos_fs_info_t  *fs_info = parent_loc->mt_entry->fs_info;

cpukit/libfs/src/dosfs/msdos_eval.c

@@ -63,6 +63,8 @@ static bool msdos_is_directory(
   void *arg
 )
 {
+  (void) arg;
+
   rtems_filesystem_location_info_t *currentloc =
     rtems_filesystem_eval_path_get_currentloc( ctx );
   fat_file_fd_t *fat_fd = currentloc->node_access;
@@ -77,6 +79,8 @@ static rtems_filesystem_eval_path_generic_status msdos_eval_token(
   size_t tokenlen
 )
 {
+  (void) arg;
+
   rtems_filesystem_eval_path_generic_status status =
     RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_DONE;
 

cpukit/libfs/src/dosfs/msdos_misc.c

@@ -1316,6 +1316,8 @@ msdos_find_file_in_directory (
     uint32_t                             *empty_file_offset,
     uint32_t                             *empty_entry_count)
 {
+    (void) name_type;
+
     int               rc                = RC_OK;
     ssize_t           bytes_read;
     uint32_t          dir_entry;

cpukit/libfs/src/dosfs/msdos_mknod.c

@@ -45,6 +45,8 @@ int msdos_mknod(
     dev_t dev
 )
 {
+    (void) dev;
+
     int                  rc = RC_OK;
     fat_file_type_t      type = FAT_DIRECTORY;
 

cpukit/libfs/src/dosfs/msdos_rename.c

@@ -63,6 +63,8 @@ msdos_rename(
     size_t new_namelen
 )
 {
+    (void) old_parent_loc;
+
     int                rc = RC_OK;
     fat_file_fd_t     *old_fat_fd  = old_loc->node_access;
     fat_dir_pos_t      old_pos = old_fat_fd->dir_pos;

cpukit/libfs/src/dosfs/msdos_rmnod.c

@@ -27,6 +27,8 @@ int
 msdos_rmnod(const rtems_filesystem_location_info_t *parent_pathloc,
             const rtems_filesystem_location_info_t *pathloc)
 {
+    (void) parent_pathloc;
+
     int                rc = RC_OK;
     msdos_fs_info_t   *fs_info = pathloc->mt_entry->fs_info;
     fat_file_fd_t     *fat_fd = pathloc->node_access;