packfile: remove GIT_DEBUG_LOOKUP log statements

In commit 628522ec14 ("sha1-lookup: more memory efficient search in
sorted list of SHA-1", 2008-04-09), a different algorithm for searching
a sorted list was introduced, together with a set of log statements
guarded by GIT_DEBUG_LOOKUP that are invoked both when using that
algorithm and when using the existing binary search. Those log
statements was meant for experiments and debugging, but with the removal
of the aforementioned different algorithm in commit f1068efefe
("sha1_file: drop experimental GIT_USE_LOOKUP search", 2017-08-09),
those log statements are probably no longer necessary.

Remove those statements.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

packfile.c

@@ -1713,10 +1713,6 @@ off_t find_pack_entry_one(const unsigned char *sha1,
 	const uint32_t *level1_ofs = p->index_data;
 	const unsigned char *index = p->index_data;
 	unsigned hi, lo, stride;
-	static int debug_lookup = -1;
-
-	if (debug_lookup < 0)
-		debug_lookup = !!getenv("GIT_DEBUG_LOOKUP");
 
 	if (!index) {
 		if (open_pack_index(p))
@@ -1738,17 +1734,10 @@ off_t find_pack_entry_one(const unsigned char *sha1,
 		index += 4;
 	}
 
-	if (debug_lookup)
-		printf("%02x%02x%02x... lo %u hi %u nr %"PRIu32"\n",
-		       sha1[0], sha1[1], sha1[2], lo, hi, p->num_objects);
-
 	while (lo < hi) {
 		unsigned mi = lo + (hi - lo) / 2;
 		int cmp = hashcmp(index + mi * stride, sha1);
 
-		if (debug_lookup)
-			printf("lo %u hi %u rg %u mi %u\n",
-			       lo, hi, hi - lo, mi);
 		if (!cmp)
 			return nth_packed_object_offset(p, mi);
 		if (cmp > 0)