procfs: add stub for proc_mkdir_mode()

Provide a stub for proc_mkdir_mode() when CONFIG_PROC_FS is not
enabled, just like the stub for proc_mkdir().

Fixes this linux-next build error:

drivers/net/wireless/airo.c:4504: error: implicit declaration of function 'proc_mkdir_mode'

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: "John W. Linville" <linville@tuxdriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

authored by Randy Dunlap and committed by Linus Torvalds f12a20fc b2db2199

+2
+2
include/linux/proc_fs.h
··· 208 struct proc_dir_entry *parent,const char *dest) {return NULL;} 209 static inline struct proc_dir_entry *proc_mkdir(const char *name, 210 struct proc_dir_entry *parent) {return NULL;} 211 212 static inline struct proc_dir_entry *create_proc_read_entry(const char *name, 213 mode_t mode, struct proc_dir_entry *base,
··· 208 struct proc_dir_entry *parent,const char *dest) {return NULL;} 209 static inline struct proc_dir_entry *proc_mkdir(const char *name, 210 struct proc_dir_entry *parent) {return NULL;} 211 + static inline struct proc_dir_entry *proc_mkdir_mode(const char *name, 212 + mode_t mode, struct proc_dir_entry *parent) { return NULL; } 213 214 static inline struct proc_dir_entry *create_proc_read_entry(const char *name, 215 mode_t mode, struct proc_dir_entry *base,