Add prototype and remove warning.

git-svn-id: https://cryptsetup.googlecode.com/svn/trunk@533 36d66b0a-2a48-0410-832c-cd162a569da5

lib/utils_devpath.c

@@ -28,6 +28,8 @@
 #include <sys/types.h>
 #include "utils_dm.h"
 
+char *crypt_lookup_dev(const char *dev_id);
+
 static char *__lookup_dev(char *path, dev_t dev, int dir_level, const int max_level)
 {
 	struct dirent *entry;