sysfs: return st instead of accepting it (#1261)

This returns stat as a value instead of a pointer param. This is both
more efficient and faster. It is also more efficient than returning a
pointer to a stat.

Signed-off-by: Adrian Cole <adrian@tetrate.io>

internal/sysfs/readfs.go

@@ -141,13 +141,13 @@ func maskForReads(f fs.File) fs.File {
 }
 
 // Lstat implements FS.Lstat
-func (r *readFS) Lstat(path string, lstat *platform.Stat_t) error {
-	return r.fs.Lstat(path, lstat)
+func (r *readFS) Lstat(path string) (platform.Stat_t, error) {
+	return r.fs.Lstat(path)
 }
 
 // Stat implements FS.Stat
-func (r *readFS) Stat(path string, stat *platform.Stat_t) error {
-	return r.fs.Stat(path, stat)
+func (r *readFS) Stat(path string) (platform.Stat_t, error) {
+	return r.fs.Stat(path)
 }
 
 // Readlink implements FS.Readlink