zdtm: Mark some functions as static

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm/lib/ns.c

@@ -175,7 +175,7 @@ write_out:
 }
 
 #define STATUS_FD 255
-int ns_exec(void *_arg)
+static int ns_exec(void *_arg)
 {
 	struct ns_exec_args *args = (struct ns_exec_args *) _arg;
 	char buf[4096];

test/zdtm/lib/test.c

@@ -53,7 +53,7 @@ static void test_fini(void)
 	unlink(pidfile);
 }
 
-void setup_outfile()
+static void setup_outfile()
 {
 	if (!access(outfile, F_OK) || errno != ENOENT) {
 		fprintf(stderr, "Output file %s appears to exist, aborting\n",

test/zdtm/lib/zdtmtst.h

@@ -99,7 +99,6 @@ extern int parse_opt_string(char *param, void *arg);
 #define __stringify(x)          __stringify_1(x)
 
 /* message helpers */
-extern void setup_outfile(void);
 extern int test_log_init(const char *outfile, const char *suffix);
 extern int zdtm_seccomp;
 #define pr_err(format, arg...) \