remove needless check for 'line' which cannot be NULl there

src/lxc/attach.c

@@ -358,7 +358,7 @@ char *lxc_attach_getpwshell(uid_t uid)
 				continue;
 
 			/* trim line on the right hand side */
-			for (i = strlen(line); line && i > 0 && (line[i - 1] == '\n' || line[i - 1] == '\r'); --i)
+			for (i = strlen(line); i > 0 && (line[i - 1] == '\n' || line[i - 1] == '\r'); --i)
 				line[i - 1] = '\0';
 
 			/* split into tokens: first user name */