[PATCH v2] git log: avoid segfault with --all-match

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Avoid a segfault when the command

	git log --all-match

was issued, by ignoring the option.

Signed-off-by: Michele Ballabio <barra_cuda@xxxxxxxxxxxx>
---
 grep.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/grep.c b/grep.c
index 062b2b6..cb4666d 100644
--- a/grep.c
+++ b/grep.c
@@ -190,7 +190,8 @@ void compile_grep_patterns(struct grep_opt *opt)
 	 * A classic recursive descent parser would do.
 	 */
 	p = opt->pattern_list;
-	opt->pattern_expression = compile_pattern_expr(&p);
+	if (p)
+		opt->pattern_expression = compile_pattern_expr(&p);
 	if (p)
 		die("incomplete pattern expression: %s", p->pattern);
 }
-- 
1.6.2.22.gc2ac

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