ethdb: remove unnecessary function wrapper (#29888)

ethdb/dbtest/testsuite.go

@@ -530,7 +530,7 @@ func makeDataset(size, ksize, vsize int, order bool) ([][]byte, [][]byte) {
 		vals = append(vals, randBytes(vsize))
 	}
 	if order {
-		slices.SortFunc(keys, func(a, b []byte) int { return bytes.Compare(a, b) })
+		slices.SortFunc(keys, bytes.Compare)
 	}
 	return keys, vals
 }

ethdb/pebble/pebble.go

@@ -207,7 +207,7 @@ func New(file string, cache int, handles int, namespace string, readonly bool, e
 
 		// The default compaction concurrency(1 thread),
 		// Here use all available CPUs for faster compaction.
-		MaxConcurrentCompactions: func() int { return runtime.NumCPU() },
+		MaxConcurrentCompactions: runtime.NumCPU,
 
 		// Per-level options. Options for at least one level must be specified. The
 		// options for the last level are used for all subsequent levels.