Spelling fixes in comments, documentation, tests and examples

By klemens <ka7@github.com>

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

util-linux/cal.c

@@ -35,7 +35,7 @@
 #include "libbb.h"
 #include "unicode.h"
 
-/* We often use "unsigned" intead of "int", it's easier to div on most CPUs */
+/* We often use "unsigned" instead of "int", it's easier to div on most CPUs */
 
 #define	THURSDAY		4		/* for reformation */
 #define	SATURDAY		6		/* 1 Jan 1 was a Saturday */

util-linux/hwclock.c

@@ -167,7 +167,7 @@ static void from_sys_clock(const char **pp_rtcname, int utc)
  * On x86, even though code does set hw clock within <1ms of exact
  * whole seconds, apparently hw clock (at least on some machines)
  * doesn't reset internal fractional seconds to 0,
- * making all this a pointless excercise.
+ * making all this a pointless exercise.
  */
 	/* If we see that we are N usec away from whole second,
 	 * we'll sleep for N-ADJ usecs. ADJ corrects for the fact

util-linux/renice.c

@@ -141,7 +141,7 @@ int renice_main(int argc UNUSED_PARAM, char **argv)
 		retval = EXIT_FAILURE;
 	}
 
-	/* No need to check for errors outputing to stderr since, if it
+	/* No need to check for errors outputting to stderr since, if it
 	 * was used, the HAD_ERROR label was reached and retval was set. */
 
 	return retval;

util-linux/switch_root.c

@@ -183,7 +183,7 @@ So there's a step that needs to be sort of atomic but can't be as a shell
 script.  (You can work around this with static linking or very carefully laid
 out paths and sequencing, but it's brittle, ugly, and non-obvious.)
 
-2) The "find | rm" bit will acually delete everything because the mount points
+2) The "find | rm" bit will actually delete everything because the mount points
 still show up (even if their contents don't), and rm -rf will then happily zap
 that.  So the first line is an oversimplification of what you need to do _not_
 to descend into other filesystems and delete their contents.

util-linux/volume_id/udf.c

@@ -137,7 +137,7 @@ anchor:
 	if (type != 2) /* TAG_ID_AVDP */
 		goto found;
 
-	/* get desriptor list address and block count */
+	/* get descriptor list address and block count */
 	count = le32_to_cpu(vd->type.anchor.length) / bs;
 	loc = le32_to_cpu(vd->type.anchor.location);
 	dbg("0x%x descriptors starting at logical secor 0x%x", count, loc);