Fix go lint errors

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

sys/stat_unix.go

@@ -6,14 +6,17 @@ import (
 	"syscall"
 )
 
+// StatAtime returns the Atim
 func StatAtime(st *syscall.Stat_t) syscall.Timespec {
 	return st.Atim
 }
 
+// StatCtime returns the Ctim
 func StatCtime(st *syscall.Stat_t) syscall.Timespec {
 	return st.Ctim
 }
 
+// StatMtime returns the Mtim
 func StatMtime(st *syscall.Stat_t) syscall.Timespec {
 	return st.Mtim
 }