fix double free bug

Signed-off-by: Lai Jiangshan <jiangshanlai@gmail.com>

src/container.c

@@ -525,6 +525,7 @@ static int hyper_container_init(void *data)
 
 		if (container->scsiaddr) {
 			free(container->image);
+			container->image = NULL;
 			hyper_find_sd(container->scsiaddr, &container->image);
 		}
 

src/util.c

@@ -134,7 +134,6 @@ int hyper_find_sd(char *addr, char **dev)
 		}
 
 		fprintf(stdout, "%s get %s\n", path, dir->d_name);
-		free(*dev);
 		*dev = strdup(dir->d_name);
 		break;
 	}