zdtm: print string describing error number

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm/lib/zdtmtst.h

@@ -87,10 +87,10 @@ extern int parse_opt_string(char *param, void *arg);
 extern void setup_outfile(void);
 extern int test_log_init(const char *outfile, const char *suffix);
 #define err(format, arg...)	\
-	test_msg("ERR: %s:%d: " format " (errno = %d)\n", \
+	test_msg("ERR: %s:%d: " format " (errno = %d (%m))\n", \
 		__FILE__, __LINE__, ## arg, errno)
 #define fail(format, arg...)	\
-	test_msg("FAIL: %s:%d: " format " (errno = %d)\n", \
+	test_msg("FAIL: %s:%d: " format " (errno = %d (%m))\n", \
 		 __FILE__, __LINE__, ## arg, errno)
 #define skip(format, arg...)	\
 	test_msg("SKIP: %s:%d: " format "\n", \