lib/c: add const qualifier to criu_set_service_binary

service_binary is either set to a const char * (CR_DEFAULT_SERVICE_BIN)
or to a user provided char *, but there is no reason to give a char *.
Users of such function will most likely provide a const char *,
that will generate a warning.
Thus, we add the const qualifier to better represent the usage of
service_binary, and avoid such warnings.
Signed-off-by: Ronny Chevalier <ronny.chevalier@hp.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

lib/c/criu.c

@@ -27,7 +27,7 @@ struct criu_opts {
 	union {
 		char		*service_address;
 		int		service_fd;
-		char		*service_binary;
+		const char	*service_binary;
 	};
 	int			swrk_pid;
 };
@@ -68,7 +68,7 @@ void criu_set_service_fd(int fd)
 	criu_local_set_service_fd(global_opts, fd);
 }
 
-void criu_local_set_service_binary(criu_opts *opts, char *path)
+void criu_local_set_service_binary(criu_opts *opts, const char *path)
 {
 	if (path)
 		opts->service_binary = path;
@@ -76,7 +76,7 @@ void criu_local_set_service_binary(criu_opts *opts, char *path)
 		opts->service_binary = CR_DEFAULT_SERVICE_BIN;
 }
 
-void criu_set_service_binary(char *path)
+void criu_set_service_binary(const char *path)
 {
 	criu_local_set_service_binary(global_opts, path);
 }

lib/c/criu.h

@@ -43,7 +43,7 @@ enum criu_cg_mode {
 
 void criu_set_service_address(char *path);
 void criu_set_service_fd(int fd);
-void criu_set_service_binary(char *path);
+void criu_set_service_binary(const char *path);
 
 /*
  * You can choose if you want libcriu to connect to service socket