btrfs: disable rate limiting when debug enabled

Disable ratelimiting for btrfs_printk when CONFIG_BTRFS_DEBUG is
enabled. This allows for more verbose output which is often needed by
functions like btrfs_dump_space_info().

Reviewed-by: Qu Wenruo <[e-mail]>
Signed-off-by: Leo Martins <[e-mail]>
Reviewed-by: David Sterba <[e-mail]>
Signed-off-by: David Sterba <[e-mail]>

fs/btrfs/messages.c

···
 	vaf.fmt = fmt;
 	vaf.va = &args;
 
-	if (__ratelimit(ratelimit)) {
+	/* Do not ratelimit if CONFIG_BTRFS_DEBUG is enabled. */
+	if (IS_ENABLED(CONFIG_BTRFS_DEBUG) || __ratelimit(ratelimit)) {
 		if (fs_info) {
 			char statestr[STATE_STRING_BUF_LEN];