syscall: wrap fstatat only once on linux/{arm64,riscv64}

Currently the linux/arm64 and linux/riscv64 ports wrap the fstatat
syscall twice, once in func fstatat and once in func Fstatat. Change the
latter to be a simple wrapper around the former to deduplicate some
code.

Change-Id: I82ec9374e2bcfe116eabf01f021eed1ee810ec15
Reviewed-on: https://go-review.googlesource.com/c/go/+/412934
Reviewed-by: Ian Lance Taylor <[email protected]>
Auto-Submit: Tobias Klauser <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Run-TryBot: Tobias Klauser <[email protected]>
Reviewed-by: Than McIntosh <[email protected]>

Author: tklauser

src/syscall/syscall_linux_arm64.go

@@ -18,8 +18,12 @@ func EpollCreate(size int) (fd int, err error) {
 //sys	EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) = SYS_EPOLL_PWAIT
 //sys	Fchown(fd int, uid int, gid int) (err error)
 //sys	Fstat(fd int, stat *Stat_t) (err error)
-//sys	Fstatat(fd int, path string, stat *Stat_t, flags int) (err error)
 //sys	fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error)
+
+func Fstatat(fd int, path string, stat *Stat_t, flags int) error {
+	return fstatat(fd, path, stat, flags)
+}
+
 //sys	Fstatfs(fd int, buf *Statfs_t) (err error)
 //sys	Ftruncate(fd int, length int64) (err error)
 //sysnb	Getegid() (egid int)
@@ -40,15 +44,15 @@ func EpollCreate(size int) (fd int, err error) {
 //sys	Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, err error)
 
 func Stat(path string, stat *Stat_t) (err error) {
-	return Fstatat(_AT_FDCWD, path, stat, 0)
+	return fstatat(_AT_FDCWD, path, stat, 0)
 }
 
 func Lchown(path string, uid int, gid int) (err error) {
 	return Fchownat(_AT_FDCWD, path, uid, gid, _AT_SYMLINK_NOFOLLOW)
 }
 
 func Lstat(path string, stat *Stat_t) (err error) {
-	return Fstatat(_AT_FDCWD, path, stat, _AT_SYMLINK_NOFOLLOW)
+	return fstatat(_AT_FDCWD, path, stat, _AT_SYMLINK_NOFOLLOW)
 }
 
 //sys	Statfs(path string, buf *Statfs_t) (err error)

src/syscall/syscall_linux_riscv64.go

@@ -18,8 +18,12 @@ func EpollCreate(size int) (fd int, err error) {
 //sys	EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) = SYS_EPOLL_PWAIT
 //sys	Fchown(fd int, uid int, gid int) (err error)
 //sys	Fstat(fd int, stat *Stat_t) (err error)
-//sys	Fstatat(fd int, path string, stat *Stat_t, flags int) (err error)
 //sys	fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error)
+
+func Fstatat(fd int, path string, stat *Stat_t, flags int) error {
+	return fstatat(fd, path, stat, flags)
+}
+
 //sys	Fstatfs(fd int, buf *Statfs_t) (err error)
 //sys	Ftruncate(fd int, length int64) (err error)
 //sysnb	Getegid() (egid int)
@@ -44,15 +48,15 @@ func Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err e
 }
 
 func Stat(path string, stat *Stat_t) (err error) {
-	return Fstatat(_AT_FDCWD, path, stat, 0)
+	return fstatat(_AT_FDCWD, path, stat, 0)
 }
 
 func Lchown(path string, uid int, gid int) (err error) {
 	return Fchownat(_AT_FDCWD, path, uid, gid, _AT_SYMLINK_NOFOLLOW)
 }
 
 func Lstat(path string, stat *Stat_t) (err error) {
-	return Fstatat(_AT_FDCWD, path, stat, _AT_SYMLINK_NOFOLLOW)
+	return fstatat(_AT_FDCWD, path, stat, _AT_SYMLINK_NOFOLLOW)
 }
 
 //sys	Statfs(path string, buf *Statfs_t) (err error)