patch 9.0.1383: xxd: combination of little endian and cols fails

Problem:    xxd: combination of little endian and cols fails. (Aapo
            Rantalainen)
Solution:   Round up the space taken by the hex output. (closes #12097)

Author: brammool

src/testdir/test_xxd.vim

@@ -401,4 +401,18 @@ func Test_xxd_plain_one_line()
   endfor
 endfunc
 
+func Test_xxd_little_endian_with_cols()
+  enew!
+  call writefile(["ABCDEF"], 'Xxdin', 'D')
+  exe 'r! ' .. s:xxd_cmd .. ' -e -c6 ' .. ' Xxdin'
+  call assert_equal('00000000: 44434241     4645   ABCDEF', getline(2))
+
+  enew!
+  call writefile(["ABCDEFGHI"], 'Xxdin', 'D')
+  exe 'r! ' .. s:xxd_cmd .. ' -e -c9 ' .. ' Xxdin'
+  call assert_equal('00000000: 44434241 48474645       49   ABCDEFGHI', getline(2))
+
+  bwipe!
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1383,
 /**/
     1382,
 /**/

src/xxd/xxd.c

@@ -837,7 +837,8 @@ main(int argc, char *argv[])
 	{
 	  addrlen = sprintf(l, decimal_offset ? "%08ld:" : "%08lx:",
 				  ((unsigned long)(n + seekoff + displayoff)));
-	  for (c = addrlen; c < LLEN; l[c++] = ' ');
+	  for (c = addrlen; c < LLEN; l[c++] = ' ')
+	    ;
 	}
       x = hextype == HEX_LITTLEENDIAN ? p ^ (octspergrp-1) : p;
       c = addrlen + 1 + (grplen * x) / octspergrp;
@@ -857,7 +858,12 @@ main(int argc, char *argv[])
       if (ebcdic)
 	e = (e < 64) ? '.' : etoa64[e-64];
       /* When changing this update definition of LLEN above. */
-      c = addrlen + 3 + (grplen * cols - 1)/octspergrp + p;
+      if (hextype == HEX_LITTLEENDIAN)
+	/* last group will be fully used, round up */
+	c = grplen * ((cols + octspergrp - 1) / octspergrp);
+      else
+	c = (grplen * cols - 1) / octspergrp;
+      c += addrlen + 3 + p;
       l[c++] =
 #ifdef __MVS__
 	  (e >= 64)