Fix a few misspellings in comments

Reported by kernel's checkpatch.pl script.

NEWS

@@ -847,7 +847,7 @@ Changes in 4.4
 ==============
 * Fix Linux/ia64 support, looks like someone renamed a few things on us
 * Fix the ioctl setup for Linux, turned out it did not really work.
-  Improve the ioctl extracter as well so we decode some more ones.
+  Improve the ioctl extractor as well so we decode some more ones.
 
 Changes in 4.3.1
 ================
@@ -939,7 +939,7 @@ New Features in version 3.0
 ===========================
 
 * non-ascii strings can be optionally printed entirely in hex
-* the output format is readable when mutiple processes are generating output
+* the output format is readable when multiple processes are generating output
 * exit values are printed in an alignment column
 * is is possible to suppress messages about attaching and detaching
 * various tracing features can be enabled on a per syscall/signal/desc basis

linux/ptp_clock.h

@@ -90,7 +90,7 @@ struct ptp_sys_offset {
 #define PTP_SYS_OFFSET     _IOW(PTP_CLK_MAGIC, 5, struct ptp_sys_offset)
 
 struct ptp_extts_event {
-	struct ptp_clock_time t; /* Time event occured. */
+	struct ptp_clock_time t; /* Time event occurred. */
 	unsigned int index;      /* Which channel produced the event. */
 	unsigned int flags;      /* Reserved for future use. */
 	unsigned int rsv[2];     /* Reserved for future use. */

strace.c

@@ -2413,7 +2413,7 @@ next_event(int *pstatus, siginfo_t *si)
 		 * Is this post-attach SIGSTOP?
 		 * Interestingly, the process may stop
 		 * with STOPSIG equal to some other signal
-		 * than SIGSTOP if we happend to attach
+		 * than SIGSTOP if we happened to attach
 		 * just before the process takes a signal.
 		 */
 		if (sig == SIGSTOP && (tcp->flags & TCB_IGNORE_ONE_SIGSTOP)) {

syscall.c

@@ -847,7 +847,7 @@ syscall_exiting_trace(struct tcb *tcp, struct timeval tv, int res)
 	/* FIXME: not_failing_only (IOW, option -z) is broken:
 	 * failure of syscall is known only after syscall return.
 	 * Thus we end up with something like this on, say, ENOENT:
-	 *     open("doesnt_exist", O_RDONLY <unfinished ...>
+	 *     open("does_not_exist", O_RDONLY <unfinished ...>
 	 *     {next syscall decode}
 	 * whereas the intended result is that open(...) line
 	 * is not shown at all.

test/skodic.c

@@ -1,7 +1,7 @@
 /*
  * This demonstrates races: kernel may actually open other file
  * than you read in the strace output.
- * If you see a successfull open of /etc/shadow,
+ * If you see a successful open of /etc/shadow,
  * you know you've seen a race.
  *
  * $ gcc -Wall -O0 skodic.c -o skodic

tests/perf_event_open.c

@@ -73,7 +73,7 @@ struct u64_val_str {
 	const char *str;
 };
 
-/* In order to avoid endianess-specific hackery */
+/* In order to avoid endianness-specific hackery. */
 struct pea_flags {
 	uint64_t disabled                 :1,
 	         inherit                  :1,

tests/tests.h

@@ -66,7 +66,7 @@ void skip_if_unavailable(const char *);
 
 /*
  * Allocate memory that ends on the page boundary.
- * Pages allocated by this call are preceeded by an unmapped page
+ * Pages allocated by this call are preceded by an unmapped page
  * and followed also by an unmapped page.
  */
 void *tail_alloc(const size_t)