fix a leftover from vslp times - overlooked increment by one for crc32

noticed after varnish core merge

src/shard_hash.c

@@ -56,12 +56,7 @@ vle32enc(void *pp, uint32_t u)
 static uint32_t __match_proto__(hash_func)
 shard_hash_crc32(VCL_STRING s)
 {
-	uint32_t crc;
-	crc = crc32(~0U, (const unsigned char*)s, strlen(s));
-	crc ^= ~0U;
-	crc++;
-
-	return (crc);
+	return (crc32_l(s, strlen(s)));
 }
 
 static uint32_t __match_proto__(hash_func)

src/tests/v01000.vtc

@@ -136,9 +136,9 @@ logexpect l1 -v v1 -g raw -d 1 {
 
 	expect 0 =    CLI   Loaded
 
-	expect * =    Debug {^shard: lookup key 68b902f8 idx 29 host 0}
-	expect * =    Debug {^shard: lookup key 39dc4614 idx 20 host 1}
-	expect * =    Debug {^shard: lookup key c7793506 idx 59 host 2}
+	expect * =    Debug {^shard: lookup key 68b902f7 idx 29 host 0}
+	expect * =    Debug {^shard: lookup key 39dc4613 idx 20 host 1}
+	expect * =    Debug {^shard: lookup key c7793505 idx 59 host 2}
 } -start
 
 client c1 {