Revert "UBIFS: add a log overlap assertion"

This reverts commit 545f7fdf.

Hujianyang's testing revealed that the patch is bogus.
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

fs/ubifs/misc.h

@@ -297,7 +297,6 @@ static inline int ubifs_next_log_lnum(const struct ubifs_info *c, int lnum)
 	if (lnum > c->log_last)
 		lnum = UBIFS_LOG_LNUM;
 
-	ubifs_assert(lnum != c->ltail_lnum);
 	return lnum;
 }