kconfig: nconf: Format and print 'line' without a temporary copy

Use "%.*s" as the format specifier and supply the 'line' length 'len' to
mvwprintw() to format and print each line without making a temporary
copy. Remove the temporary buffer.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Reviewed-by: Nicolas Schier <nsc@kernel.org>
Link: https://lore.kernel.org/r/20250811161650.37428-2-thorsten.blum@linux.dev
Signed-off-by: Nathan Chancellor <nathan@kernel.org>

Author: toblux

scripts/kconfig/nconf.gui.c

@@ -173,12 +173,10 @@ void fill_window(WINDOW *win, const char *text)
 	/* do not go over end of line */
 	total_lines = min(total_lines, y);
 	for (i = 0; i < total_lines; i++) {
-		char tmp[x+10];
 		const char *line = get_line(text, i);
-		int len = get_line_length(line);
-		strncpy(tmp, line, min(len, x));
-		tmp[len] = '\0';
-		mvwprintw(win, i, 0, "%s", tmp);
+		int len = min(get_line_length(line), x);
+
+		mvwprintw(win, i, 0, "%.*s", len, line);
 	}
 }