NOMMU: Remove an extraneous no_printk()

Remove an extraneous no_printk() in mm/nommu.c that got missed when the
function got generalised from several things that used it in commit
12fdff3fc248 ("Add a dummy printk function for the maintenance of unused
printks").

Without this, the following error is observed:

mm/nommu.c:41: error: conflicting types for 'no_printk'
include/linux/kernel.h:314: error: previous definition of 'no_printk' was here

Reported-by: Michal Simek <[e-mail]>
Signed-off-by: David Howells <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

mm/nommu.c

···
 #include <asm/mmu_context.h>
 #include "internal.h"
 
-static inline __attribute__((format(printf, 1, 2)))
-void no_printk(const char *fmt, ...)
-{
-}
-
 #if 0
 #define kenter(FMT, ...) \
 	printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)