treewide: Replace mktemp by mkstemp

mktemp has been removed in POSIX 2008. uClibc-ng optionally does not make
it available.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

backend/avision.c

@@ -7921,7 +7921,7 @@ sane_open (SANE_String_Const devicename, SANE_Handle *handle)
        However, I was told Cygwin (et al.) takes care of it. */
     strncpy(s->duplex_rear_fname, "/tmp/avision-rear-XXXXXX", PATH_MAX);
 
-    if (! mktemp(s->duplex_rear_fname) ) {
+    if (! mkstemp(s->duplex_rear_fname) ) {
       DBG (1, "sane_open: failed to generate temporary fname for duplex scans\n");
       return SANE_STATUS_NO_MEM;
     }

backend/canon-sane.c

@@ -1125,9 +1125,9 @@ sane_start (SANE_Handle handle)
 
       if (thistmpfile != NULL)
         {
-          if (mktemp(thistmpfile) == 0)
+          if (!mkstemp(thistmpfile))
             {
-              DBG(1, "mktemp(thistmpfile) is failed\n");
+              DBG(1, "mkstemp(thistmpfile) is failed\n");
               return (SANE_STATUS_INVAL);
 	    }
 	}

backend/canon630u-common.c

@@ -939,7 +939,7 @@ plugin_cal (CANON_Handle * s)
     {
       DBG (1, "No temp filename!\n");
       s->fname = strdup ("/tmp/cal.XXXXXX");
-      mktemp (s->fname);
+      mkstemp (s->fname);
     }
   s->width = 2551;
   s->height = 75;
@@ -1583,7 +1583,7 @@ CANON_start_scan (CANON_Handle * scanner)
 
   /* choose a temp file name for scan data */
   scanner->fname = strdup ("/tmp/scan.XXXXXX");
-  if (!mktemp (scanner->fname))
+  if (!mkstemp (scanner->fname))
     return SANE_STATUS_IO_ERROR;
 
   /* calibrate if needed */

backend/dc25.c

@@ -2030,7 +2030,7 @@ sane_open (SANE_String_Const devicename, SANE_Handle * handle)
   if (tmpname == NULL)
     {
       tmpname = tmpnamebuf;
-      if (mktemp (tmpname) == NULL)
+      if (!mkstemp (tmpname))
 	{
 	  DBG (1, "Unable to make temp file %s\n", tmpname);
 	  return SANE_STATUS_INVAL;

sanei/sanei_scsi.c

@@ -615,7 +615,7 @@ open_aspi (void)
   DBG (1, "OS/2: unique id is    '%s'\n", PSRBlock->u.inq.unique_id);
 
   strcpy (tmpAspi, "asXXXXXX");
-  mktemp (tmpAspi);
+  mkstemp (tmpAspi);
   DBG (2, "open_aspi: open temporary file '%s'\n", tmpAspi);
   tmp = fopen (tmpAspi, "w");
   if (!tmp)