Fix typos - remove duplicate "is".

PR:		docs/154934
Submitted by:	Eitan Adler <lists at eitanadler.com>
MFC after:	3 days

sbin/growfs/growfs.c

@@ -646,7 +646,7 @@ cond_bl_upd(ufs2_daddr_t *block, struct gfs_bpp *field, int fsi, int fso,
 		/*
 		 * Copy the block back immediately.
 		 *
-		 * XXX	If src is is from an indirect block we have
+		 * XXX	If src is from an indirect block we have
 		 *	to implement copy on write here in case of
 		 *	active snapshots.
 		 */

share/doc/papers/devfs/paper.me

@@ -779,7 +779,7 @@ The entry points to the device driver are stored in the specinfo
 structure, removing the need for the devsw[] array and allowing
 device drivers to use separate entrypoints for various minor numbers.
 .lp
-This is is very convenient for devices which have a ``control''
+This is very convenient for devices which have a ``control''
 device for management and tuning.  The control device, almost always
 have entirely separate open/close/ioctl implementations [MD.C].
 .lp

share/doc/psd/23.rpc/rpc.prog.ms

@@ -71,7 +71,7 @@ manual page.
 .I "The Highest Layer:"
 .IX RPC "The Highest Layer"
 The highest layer is totally transparent to the operating system,
-machine and network upon which is is run.  It's probably best to
+machine and network upon which is run.  It's probably best to
 think of this level as a way of
 .I using
 RPC, rather than as

sys/fs/nullfs/null_vnops.c

@@ -672,7 +672,7 @@ null_unlock(struct vop_unlock_args *ap)
  * as soon as possible.
  *
  * Note, we can't release any resources nor remove vnode from hash before 
- * appropriate VXLOCK stuff is is done because other process can find this
+ * appropriate VXLOCK stuff is done because other process can find this
  * vnode in hash during inactivation and may be sitting in vget() and waiting
  * for null_inactive to unlock vnode. Thus we will do all those in VOP_RECLAIM.
  */

sys/libkern/jenkins.h

@@ -16,7 +16,7 @@
   the public domain.  It has no warranty.
 
   You probably want to use hashlittle().  hashlittle() and hashbig()
-  hash byte arrays.  hashlittle() is is faster than hashbig() on
+  hash byte arrays.  hashlittle() is faster than hashbig() on
   little-endian machines.  Intel and AMD are little-endian machines.
   On second thought, you probably want hashlittle2(), which is identical to
   hashlittle() except it returns two 32-bit hashes for the price of one.

sys/net80211/ieee80211_ageq.c

@@ -154,7 +154,7 @@ ieee80211_ageq_drain_node(struct ieee80211_ageq *aq,
  * deltas (in seconds) relative to the head so we can check
  * and/or adjust only the head of the list.  If a frame's age
  * exceeds the time quanta then remove it.  The list of removed
- * frames is is returned to the caller joined by m_nextpkt.
+ * frames is returned to the caller joined by m_nextpkt.
  */
 struct mbuf *
 ieee80211_ageq_age(struct ieee80211_ageq *aq, int quanta)

sys/x86/isa/clock.c

@@ -475,7 +475,7 @@ sysctl_machdep_i8254_freq(SYSCTL_HANDLER_ARGS)
 
 	/*
 	 * Use `i8254' instead of `timer' in external names because `timer'
-	 * is is too generic.  Should use it everywhere.
+	 * is too generic.  Should use it everywhere.
 	 */
 	freq = i8254_freq;
 	error = sysctl_handle_int(oidp, &freq, 0, req);

usr.bin/tip/tip/tip.h

@@ -259,7 +259,7 @@ int	intflag;		/* recognized interrupt */
 int	stoprompt;		/* for interrupting a prompt session */
 int	timedout;		/* ~> transfer timedout */
 int	cumode;			/* simulating the "cu" program */
-int	bits8;			/* terminal is is 8-bit mode */
+int	bits8;			/* terminal is 8-bit mode */
 #define STRIP_PAR	(bits8 ? 0377 : 0177)
 
 char	fname[PATH_MAX];	/* file name buffer for ~< */