Revert "docs: sysctl/kernel: document ngroups_max"

This reverts commit 2f4c3306.

The changes here were fine, but there's a non-documentation change to
sysctl.c that makes messes elsewhere; those changes should have been done
independently.
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/admin-guide/sysctl/kernel.rst

@@ -517,15 +517,6 @@ Notes:
      successful IPC object allocation. If an IPC object allocation syscall
      fails, it is undefined if the value remains unmodified or is reset to -1.
 
-
-ngroups_max
-===========
-
-Maximum number of supplementary groups, _i.e._ the maximum size which
-``setgroups`` will accept. Exports ``NGROUPS_MAX`` from the kernel.
-
-
-
 nmi_watchdog
 ============
 

kernel/sysctl.c

@@ -146,7 +146,7 @@ static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
 static int maxolduid = 65535;
 static int minolduid;
 
-static const int ngroups_max = NGROUPS_MAX;
+static int ngroups_max = NGROUPS_MAX;
 static const int cap_last_cap = CAP_LAST_CAP;
 
 /*
@@ -883,7 +883,7 @@ static struct ctl_table kern_table[] = {
 #endif
 	{
 		.procname	= "ngroups_max",
-		.data		= (void *)&ngroups_max,
+		.data		= &ngroups_max,
 		.maxlen		= sizeof (int),
 		.mode		= 0444,
 		.proc_handler	= proc_dointvec,