fix read benchmarks (#201)

Number of shards in `read` benchmarks is always set to 1024 instead of parametrized value.

Author: janisz

bigcache_bench_test.go

@@ -56,15 +56,15 @@ func BenchmarkWriteToCache(b *testing.B) {
 func BenchmarkReadFromCache(b *testing.B) {
 	for _, shards := range []int{1, 512, 1024, 8192} {
 		b.Run(fmt.Sprintf("%d-shards", shards), func(b *testing.B) {
-			readFromCache(b, 1024, false)
+			readFromCache(b, shards, false)
 		})
 	}
 }
 
 func BenchmarkReadFromCacheWithInfo(b *testing.B) {
 	for _, shards := range []int{1, 512, 1024, 8192} {
 		b.Run(fmt.Sprintf("%d-shards", shards), func(b *testing.B) {
-			readFromCache(b, 1024, true)
+			readFromCache(b, shards, true)
 		})
 	}
 }