merge: do not add standard message when message is given with -m option

diff --git a/builtin-grep.c b/builtin-grep.c
index 761799d7d0afd62ecba99d703a8595664faa4723..1df25b07b573301bba7fdcb3b13d1af9050f513e 100644 (file)
--- a/builtin-grep.c
+++ b/builtin-grep.c
@@ -631,7 +631,7 @@ static int file_callback(const struct option *opt, const char *arg, int unset)
        struct grep_opt *grep_opt = opt->value;
        FILE *patterns;
        int lno = 0;
-       struct strbuf sb;
+       struct strbuf sb = STRBUF_INIT;
 
        patterns = fopen(arg, "r");
        if (!patterns)