Avoid using magic numbers for array size and index under `reset_merge`
function. Use `argv_array` instead. This will make code shorter and
easier to extend.

Signed-off-by: Rohit Ashiwal <rohit.ashiwal...@gmail.com>
---
 sequencer.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/sequencer.c b/sequencer.c
index 12f2605ded..6762a5f485 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -2733,13 +2733,18 @@ static int rollback_is_safe(void)
 
 static int reset_merge(const struct object_id *oid)
 {
-       const char *argv[4];    /* reset --merge <arg> + NULL */
+       int ret;
+       struct argv_array argv = ARGV_ARRAY_INIT;
 
-       argv[0] = "reset";
-       argv[1] = "--merge";
-       argv[2] = oid_to_hex(oid);
-       argv[3] = NULL;
-       return run_command_v_opt(argv, RUN_GIT_CMD);
+       argv_array_pushl(&argv, "reset", "--merge", NULL);
+
+       if (!is_null_oid(oid))
+               argv_array_push(&argv, oid_to_hex(oid));
+
+       ret = run_command_v_opt(argv.argv, RUN_GIT_CMD);
+       argv_array_clear(&argv);
+
+       return ret;
 }
 
 static int rollback_single_pick(struct repository *r)
-- 
2.21.0

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