libzfs: constify zfs_strip_partition(), zfs_strip_path()

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #13413

lib/libzutil/os/freebsd/zutil_device_path_os.c

@@ -40,7 +40,7 @@
  * Note: The caller must free the returned string.
  */
 char *
-zfs_strip_partition(char *dev)
+zfs_strip_partition(const char *dev)
 {
 	return (strdup(dev));
 }
@@ -56,8 +56,8 @@ zfs_append_partition(char *path, size_t max_len)
  * On FreeBSD we only want to remove "/dev/" from the beginning of
  * paths if present.
  */
-char *
-zfs_strip_path(char *path)
+const char *
+zfs_strip_path(const char *path)
 {
 	if (strncmp(path, _PATH_DEV, sizeof (_PATH_DEV) - 1) == 0)
 		return (path + sizeof (_PATH_DEV) - 1);

lib/libzutil/os/linux/zutil_device_path_os.c

@@ -81,7 +81,7 @@ zfs_append_partition(char *path, size_t max_len)
  * caller must free the returned string
  */
 char *
-zfs_strip_partition(char *path)
+zfs_strip_partition(const char *path)
 {
 	char *tmp = strdup(path);
 	char *part = NULL, *d = NULL;
@@ -117,7 +117,7 @@ zfs_strip_partition(char *path)
  * Returned string must be freed.
  */
 static char *
-zfs_strip_partition_path(char *path)
+zfs_strip_partition_path(const char *path)
 {
 	char *newpath = strdup(path);
 	char *sd_offset;
@@ -148,8 +148,8 @@ zfs_strip_partition_path(char *path)
 /*
  * Strip the unwanted portion of a device path.
  */
-char *
-zfs_strip_path(char *path)
+const char *
+zfs_strip_path(const char *path)
 {
 	return (strrchr(path, '/') + 1);
 }