cosmetic fixes

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@2313 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

src/files.c

@@ -2351,7 +2351,7 @@ int readable_dir(const char *path)
     /* If dir is NULL, don't do closedir(), since that changes errno. */
     if (dir != NULL)
 	closedir(dir);
-    return dir != NULL;
+    return (dir != NULL);
 }
 
 /* Initialize the browser code, including the list of files in *path */

src/nano.c

@@ -1094,7 +1094,7 @@ bool open_pipe(const char *command)
 	dup2(fd[1], fileno(stderr));
 	/* If execl() returns at all, there was an error. */
 
-	execl("/bin/sh", "sh", "-c", command, 0);
+	execl("/bin/sh", "sh", "-c", command, NULL);
 	exit(0);
     }