kernel/sysctl.c: remove duplicate UINT_MAX check on do_proc_douintvec_conv()

do_proc_douintvec_conv() has two UINT_MAX checks, we can remove one.
This has no functional changes other than fixing a compiler warning:

  kernel/sysctl.c:2190]: (warning) Identical condition '*lvalp>UINT_MAX', second condition is always false

Fixes: 4f2fec00 ("sysctl: simplify unsigned int support")
Link: http://lkml.kernel.org/r/20170919072918.12066-1-mcgrof@kernel.orgSigned-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
Reported-by: David Binderman <dcb314@hotmail.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/sysctl.c

@@ -2186,8 +2186,6 @@ static int do_proc_douintvec_conv(unsigned long *lvalp,
 				  int write, void *data)
 {
 	if (write) {
-		if (*lvalp > UINT_MAX)
-			return -EINVAL;
 		if (*lvalp > UINT_MAX)
 			return -EINVAL;
 		*valp = *lvalp;