more -Wall warning fixes from Cristian Ionescu-Idbohrn.

This time it resulted in small code changes:

function                                             old     new   delta
nexpr                                                820     828      +8
tail_main                                           1200    1202      +2
wrapf                                                166     167      +1
parse_mount_options                                  227     209     -18
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/1 up/down: 11/-18)             Total: -7 bytes

1 files changed, 2 insertions, 2 deletions

diff --git a/coreutils/expand.c b/coreutils/expand.c
index a7ac8ea84..af2ef8675 100644
--- a/coreutils/expand.c
+++ b/coreutils/expand.c
@@ -41,7 +41,7 @@ static void expand(FILE *file, unsigned tab_size, unsigned opt)
         char *line;
         char *ptr;
         int convert;
-        int pos;
+        unsigned pos;
 
         /* Increment tab_size by 1 locally.*/
         tab_size++;
@@ -80,7 +80,7 @@ static void unexpand(FILE *file, unsigned int tab_size, unsigned opt)
         int convert;
         int pos;
         int i = 0;
-        int column = 0;
+        unsigned column = 0;
 
         while ((line = xmalloc_fgets(file)) != NULL) {
                 convert = 1;