PATCH: A few very minor things coverity complained about

Coverity CID 1692322 in Src/glob.c:
  i'm pretty sure this is a false positive so add a debug message just in case

Coverity CID 1500752 in Src/Zle/compresult.c:
  remove unused assignment that also reads uninitialized pointer p

And two that were just near other things it complained about

Src/utils.c:
  Warn if maildir disappeared from under us

Src/Modules/system.c:
  stray \n in zwarn message

Src/subst.c:
  Use DIGBUFSIZE for buf holding digits

  This one would be a little hard to overflow in practice, you'd need a
  parameter at least 100000000000000 characters long, which is 100TB.
---
 Src/Modules/system.c | 2 +-
 Src/Zle/compresult.c | 2 --
 Src/glob.c           | 3 +++
 Src/subst.c          | 2 +-
 Src/utils.c          | 4 +++-
 5 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/Src/Modules/system.c b/Src/Modules/system.c
index f1c0d7042f..1f3665dba5 100644
--- a/Src/Modules/system.c
+++ b/Src/Modules/system.c
@@ -357,7 +357,7 @@ bin_sysopen(char *nam, char **args, Options ops, UNUSED(int func))
 	    for (o = sizeof(openopts)/sizeof(*openopts) - 1; o >= 0 &&
 		strcasecmp(openopts[o].name, opt); o--) {}
 	    if (o < 0) {
-		zwarnnam(nam, "unsupported option: %s\n", opt);
+		zwarnnam(nam, "unsupported option: %s", opt);
 		return 1;
 	    }
 #if defined(FD_CLOEXEC) && !defined(O_CLOEXEC)
diff --git a/Src/Zle/compresult.c b/Src/Zle/compresult.c
index 5b08895235..45f01fef5c 100644
--- a/Src/Zle/compresult.c
+++ b/Src/Zle/compresult.c
@@ -1774,8 +1774,6 @@ calclist(int showall)
                                  width < zterm_columns && nth < g->dcount;
                                  nth++, tline++) {
 
-                                m = *p;
-
                                 if (tline == tlines) {
                                     tcol++;
                                     tline = 0;
diff --git a/Src/glob.c b/Src/glob.c
index e134819552..7511c1c154 100644
--- a/Src/glob.c
+++ b/Src/glob.c
@@ -3021,6 +3021,9 @@ igetmatch(char **sp, Patprog p, int fl, int n, char *replstr,
 		imd.repllist = (fl & SUB_LIST) ? znewlinklist() : newlinklist();
 		if (repllistp)
 		     *repllistp = imd.repllist;
+		else {
+		    DPUTS((fl & SUB_LIST), "leaking a linklist");
+		}
 	    }
 	    ioff = 0;		/* offset into string */
 	    umlen = umltot;
diff --git a/Src/subst.c b/Src/subst.c
index 56c1ad6ddb..5f8436e280 100644
--- a/Src/subst.c
+++ b/Src/subst.c
@@ -3844,7 +3844,7 @@ colonsubscript:
      */
     if (getlen) {
 	long len = 0;
-	char buf[14];
+	char buf[DIGBUFSIZE];
 
 	if (isarr) {
 	    char **ctr;
diff --git a/Src/utils.c b/Src/utils.c
index 2a1d49e5ad..94844e4229 100644
--- a/Src/utils.c
+++ b/Src/utils.c
@@ -1645,7 +1645,9 @@ checkmailpath(char **s)
 	    char buf[PATH_MAX * 2 + 1], **arr, **ap;
 	    int buflen, ct = 1;
 
-	    if (lock) {
+	    if (!lock)
+		zerr("%e: %s", errno, *s);
+	    else {
 		char *fn;
 
 		pushheap();
-- 
2.38.1