[PATCH] cocci: drop bogus xstrdup_or_null() rule

13092a91 (cocci: refactor common patterns to use xstrdup_or_null(), 2016-10-12) introduced a rule to rewrite this conditional call to xstrdup(E) and an assignment to variable V:

    - if (E)
    -    V = xstrdup(E);

into an unconditional call to xstrdup_or_null(E) and an assignment to variable V:

    + V = xstrdup_or_null(E);

which is utterly bogus. The original code may already have an acceptable value in V and the conditional assignment may be to improve the value already in V with a copy of a better value E when (and only when) E is not NULL.

The rewritten construct unconditionally discards the existing value of V and replaces it with a copy of E, even when E is NULL, which changes the meaning of the program.

By the way, if it were

	-if (E && !V)
	-	V = xstrdup(E);
	+V = xstrdup_or_null(E);

it would probably have been correct. But there is no existing code that would have been improved by such a rule, so let's just remove the bogus one without replacing with the more specific one.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
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 contrib/coccinelle/xstrdup_or_null.cocci | 8 --------
 1 file changed, 8 deletions(-)