This is warning to notice overflow between lhs/rhs. But we don't need to care 
about overflow because it doesn't take huge value. So below is one of fixes.

diff --git a/src/undo.c b/src/undo.c
index 2bf815b..5f33b55 100644
--- a/src/undo.c
+++ b/src/undo.c
@@ -267,7 +267,7 @@ u_save(linenr_T top, linenr_T bot)
        return OK;
 
     if (top > curbuf->b_ml.ml_line_count
-           || top >= bot
+           || (unsigned long)top >= (unsigned long)bot
            || bot > curbuf->b_ml.ml_line_count + 1)
        return FALSE;   /* rely on caller to do error messages */
 

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