ext2: guard reservation window dump with EXT2FS_DEBUG

The function __rsv_window_dump() is a heavyweight debug tool that walks
the reservation red-black tree. It is currently guarded by #if 1,
forcing it to be compiled into all kernels, even production ones.

Match the rest of the file by guarding it with #ifdef EXT2FS_DEBUG,
so it is only included when explicit debugging is enabled.

This removes the unused function code from standard builds.

Signed-off-by: Milos Nikic <nikic.milos@gmail.com>
Link: https://patch.msgid.link/20260207022920.258247-1-nikic.milos@gmail.com
Signed-off-by: Jan Kara <jack@suse.cz>

fs/ext2/balloc.c

@@ -201,7 +201,7 @@ static void group_adjust_blocks(struct super_block *sb, int group_no,
  * windows(start, end). Otherwise, it will only print out the "bad" windows,
  * those windows that overlap with their immediate neighbors.
  */
-#if 1
+#ifdef EXT2FS_DEBUG
 static void __rsv_window_dump(struct rb_root *root, int verbose,
 			      const char *fn)
 {
@@ -248,7 +248,7 @@ restart:
 	__rsv_window_dump((root), (verbose), __func__)
 #else
 #define rsv_window_dump(root, verbose) do {} while (0)
-#endif
+#endif /* EXT2FS_DEBUG */
 
 /**
  * goal_in_my_reservation()