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, 3 insertions, 3 deletions

diff --git a/editors/awk.c b/editors/awk.c
index f04ea5ced..fef3246b8 100644
--- a/editors/awk.c
+++ b/editors/awk.c
@@ -676,7 +676,7 @@ static char nextchar(char **s)
         return c;
 }
 
-static int ALWAYS_INLINE isalnum_(int c)
+static ALWAYS_INLINE int isalnum_(int c)
 {
         return (isalnum(c) || c == '_');
 }
@@ -1682,7 +1682,7 @@ static void hashwalk_init(var *v, xhash *array)
 {
         char **w;
         hash_item *hi;
-        int i;
+        unsigned i;
 
         if (v->type & VF_WALK)
                 free(v->x.walker);
@@ -1996,7 +1996,7 @@ static var *exec_builtin(node *op, var *res)
         }
 
         nargs = i;
-        if (nargs < (info >> 30))
+        if ((uint32_t)nargs < (info >> 30))
                 syntax_error(EMSG_TOO_FEW_ARGS);
 
         switch (info & OPNMASK) {