log: Don't override -v0 with -v2

If we specify log level to none (0) the result is LOG_INFO (2).
Acked-by: Andrew Vagin <avagin@parallels.com>
Acked-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

crtools.c

@@ -81,7 +81,7 @@ int main(int argc, char *argv[])
 	int ret = -1;
 	bool usage_error = true;
 	int opt, idx;
-	int log_level = 0;
+	int log_level = LOG_UNSET;
 	char *imgs_dir = ".";
 	char *work_dir = NULL;
 	static const char short_opts[] = "dsRf:F:t:p:hcD:o:n:v::xVr:jlW:L:";
@@ -192,6 +192,8 @@ int main(int argc, char *argv[])
 				goto bad_arg;
 			break;
 		case 'v':
+			if (log_level == LOG_UNSET)
+				log_level = 0;
 			if (optarg) {
 				if (optarg[0] == 'v')
 					/* handle -vvvvv */

include/criu-log.h

@@ -20,6 +20,7 @@
 #ifndef __CRIU_LOG_H__
 #define __CRIU_LOG_H__
 
+#define LOG_UNSET	(-1)
 #define LOG_MSG		(0) /* Print message regardless of log level */
 #define LOG_ERROR	(1) /* Errors only, when we're in trouble */
 #define LOG_WARN	(2) /* Warnings, dazen and confused but trying to continue */

log.c

@@ -135,7 +135,7 @@ void log_fini(void)
 
 void log_set_loglevel(unsigned int level)
 {
-	if (!level)
+	if (level == LOG_UNSET)
 		current_loglevel = DEFAULT_LOGLEVEL;
 	else
 		current_loglevel = level;