cgmanager: free line at end of check_supports_multiple_controllers

This is only called at startup so it wasn't a big leak, but it is a leak.

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>

src/lxc/cgmanager.c

@@ -246,11 +246,12 @@ static void check_supports_multiple_controllers(pid_t pid)
 		}
 		if (strcmp(prevpath, colon) != 0) {
 			cgm_all_controllers_same = false;
-			fclose(f);
-			return;
+			break;
 		}
 	}
+
 	fclose(f);
+	free(line);
 }
 
 static int send_creds(int sock, int rpid, int ruid, int rgid)