unix: switch (*CPUSet).Zero to clear builtin

clear was added to Go 1.21 and is better than the manual loop approach.

Change-Id: I851203714446e21b6329e2bcf308f2571d339e36
GitHub-Last-Rev: 71dc7f0
GitHub-Pull-Request: #262
Reviewed-on: https://go-review.googlesource.com/c/sys/+/698495
Reviewed-by: Keith Randall <[email protected]>
Reviewed-by: Cherry Mui <[email protected]>
Reviewed-by: Keith Randall <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Tobias Klauser <[email protected]>
Auto-Submit: Keith Randall <[email protected]>

Author: cyphar

unix/affinity_linux.go

@@ -38,9 +38,7 @@ func SchedSetaffinity(pid int, set *CPUSet) error {
 
 // Zero clears the set s, so that it contains no CPUs.
 func (s *CPUSet) Zero() {
-	for i := range s {
-		s[i] = 0
-	}
+	clear(s[:])
 }
 
 func cpuBitsIndex(cpu int) int {