debugfs: remove return value of debugfs_create_x16()

No one checks the return value of debugfs_create_x16(), as it's not
needed, so make the return value void, so that no one tries to do so in
the future.

Link: https://lore.kernel.org/r/20191011132931.1186197-6-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/filesystems/debugfs.txt

@@ -84,8 +84,8 @@ the following functions can be used instead:
 
     struct dentry *debugfs_create_x8(const char *name, umode_t mode,
 				     struct dentry *parent, u8 *value);
-    struct dentry *debugfs_create_x16(const char *name, umode_t mode,
-				      struct dentry *parent, u16 *value);
+    void debugfs_create_x16(const char *name, umode_t mode,
+			    struct dentry *parent, u16 *value);
     struct dentry *debugfs_create_x32(const char *name, umode_t mode,
 				      struct dentry *parent, u32 *value);
     struct dentry *debugfs_create_x64(const char *name, umode_t mode,

fs/debugfs/file.c

@@ -651,10 +651,10 @@ EXPORT_SYMBOL_GPL(debugfs_create_x8);
  * @value: a pointer to the variable that the file should read to and write
  *         from.
  */
-struct dentry *debugfs_create_x16(const char *name, umode_t mode,
-				 struct dentry *parent, u16 *value)
+void debugfs_create_x16(const char *name, umode_t mode, struct dentry *parent,
+			u16 *value)
 {
-	return debugfs_create_mode_unsafe(name, mode, parent, value, &fops_x16,
+	debugfs_create_mode_unsafe(name, mode, parent, value, &fops_x16,
 				   &fops_x16_ro, &fops_x16_wo);
 }
 EXPORT_SYMBOL_GPL(debugfs_create_x16);

include/linux/debugfs.h

@@ -109,8 +109,8 @@ struct dentry *debugfs_create_ulong(const char *name, umode_t mode,
 				    struct dentry *parent, unsigned long *value);
 struct dentry *debugfs_create_x8(const char *name, umode_t mode,
 				 struct dentry *parent, u8 *value);
-struct dentry *debugfs_create_x16(const char *name, umode_t mode,
-				  struct dentry *parent, u16 *value);
+void debugfs_create_x16(const char *name, umode_t mode, struct dentry *parent,
+			u16 *value);
 struct dentry *debugfs_create_x32(const char *name, umode_t mode,
 				  struct dentry *parent, u32 *value);
 struct dentry *debugfs_create_x64(const char *name, umode_t mode,
@@ -275,12 +275,8 @@ static inline struct dentry *debugfs_create_x8(const char *name, umode_t mode,
 	return ERR_PTR(-ENODEV);
 }
 
-static inline struct dentry *debugfs_create_x16(const char *name, umode_t mode,
-						struct dentry *parent,
-						u16 *value)
-{
-	return ERR_PTR(-ENODEV);
-}
+static inline void debugfs_create_x16(const char *name, umode_t mode,
+				      struct dentry *parent, u16 *value) { }
 
 static inline struct dentry *debugfs_create_x32(const char *name, umode_t mode,
 						struct dentry *parent,