clean: simplify code && maybe fix

src/shell/exec.c

@@ -86,7 +86,7 @@ static char *get_line(void)
 	struct key_event ev;
 	const size_t size = sizeof(screen->line);
 
-	while (1) {
+	do {
 		ev = get_key();
 		if (!ev.scan_code)
 			continue;
@@ -105,9 +105,7 @@ static char *get_line(void)
 			kprintf("%c", ev.c);
 			buf[i++] = ev.c;
 		}
-		if (i >= size)
-			break;
-	}
+	} while (i < size);
 	kprintf("\n");
 	screen->line[i] = '\0';
 	return screen->line;