maint: remove doubled words in comments, e.g., s/to to/to/

* tests/ls/color-norm: s/to to/to/
* gl/lib/mbsalign.h (mbs_align_t): s/or or/or/
* src/extent-scan.c (extent_scan_read): s/the the/the/
* src/libstdbuf.c: s/the the/the/
* tests/misc/stdbuf: s/on on/on/
* ChangeLog-2005: s/for\n\tfor /for\n\t/

ChangeLog-2005

@@ -9086,7 +9086,7 @@
 
 	split's --verbose option did nothing [broken in 4.5.10 and 5.0]
 	* src/split.c (longopts): Use `1', not `0' as the value for
-	for &verbose.  Reported by Keith Thompson.
+	&verbose.  Reported by Keith Thompson.
 
 	Test for the above fix.
 	* tests/misc/split-a: Also use --verbose and compare stderr

gl/lib/mbsalign.h

@@ -19,7 +19,7 @@
 typedef enum { MBS_ALIGN_LEFT, MBS_ALIGN_RIGHT, MBS_ALIGN_CENTER } mbs_align_t;
 
 enum {
-  /* Use unibyte mode for invalid multibyte strings or
+  /* Use unibyte mode for invalid multibyte strings
      or when heap memory is exhausted.  */
   MBA_UNIBYTE_FALLBACK = 0x0001
 

src/extent-scan.c

@@ -104,7 +104,7 @@ extent_scan_read (struct extent_scan *scan)
       fiemap->fm_extent_count = count;
       fiemap->fm_length = FIEMAP_MAX_OFFSET - scan->scan_start;
 
-      /* Fall back to the standard copy if call ioctl(2) failed for the
+      /* Fall back to the standard copy if call ioctl(2) failed for
          the first time.  */
       if (ioctl (scan->fd, FS_IOC_FIEMAP, fiemap) < 0)
         {

src/libstdbuf.c

@@ -22,7 +22,7 @@
 #include "system.h"
 #include "verify.h"
 
-/* Note currently for glibc (2.3.5) the following call does not change the
+/* Note currently for glibc (2.3.5) the following call does not change
    the buffer size, and more problematically does not give any indication
    that the new size request was ignored:
 

tests/ls/color-norm

@@ -27,7 +27,7 @@ umask 22
 # Output time as something constant
 export TIME_STYLE="+norm"
 
-# helper to to strip ls columns up to "norm" time
+# helper to strip ls columns up to "norm" time
 qls() { sed 's/-r.*norm/norm/'; }
 
 touch exe || framework_failure

tests/misc/stdbuf

@@ -104,7 +104,7 @@ retry_delay_ stdbuf_unbuffer .1 6 || fail=1
 
 # Ensure block buffering stdout takes effect
 # We don't currently test block buffering failures as
-# this doesn't work on on GLIBC-2.7 or GLIBC-2.9 at least.
+# this doesn't work on GLIBC-2.7 or GLIBC-2.9 at least.
    # stdbuf_blockbuffer()
    # {
    #   local delay="$1"