internal/poll: eliminate the redundant conditional branch for isKernelVersionGE53

Follow up CL 573755

Change-Id: I27c7571d3ef1274cf2c6892e678f946f9b65de33
Reviewed-on: https://go-review.googlesource.com/c/go/+/576416
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>
Reviewed-by: Than McIntosh <[email protected]>
Reviewed-by: Tobias Klauser <[email protected]>

Author: panjf2000

src/internal/poll/copy_file_range_linux.go

@@ -15,10 +15,7 @@ var isKernelVersionGE53 = sync.OnceValue(func() bool {
 	// copy_file_range(2) is broken in various ways on kernels older than 5.3,
 	// see https://go.dev/issue/42400 and
 	// https://man7.org/linux/man-pages/man2/copy_file_range.2.html#VERSIONS
-	if major > 5 || (major == 5 && minor >= 3) {
-		return true
-	}
-	return false
+	return major > 5 || (major == 5 && minor >= 3)
 })
 
 const maxCopyFileRangeRound = 1 << 30