[PATCH] LoongArch: Fix use of logical '&&' with constant operand

[WangYuli]

Fix follow error with clang-19:

arch/loongarch/kernel/setup.c:335:40: error: use of logical '&&' with constant operand [-Werror,-Wconstant-logical-operand]
  335 |         if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) && CONFIG_CMDLINE[0]) {
      |                                               ^  ~~~~~~~~~~~~~~~~~
arch/loongarch/kernel/setup.c:335:40: note: use '&' for a bitwise operation
  335 |         if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) && CONFIG_CMDLINE[0]) {
      |                                               ^~
      |                                               &
arch/loongarch/kernel/setup.c:335:40: note: remove constant to silence this warning
  335 |         if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) && CONFIG_CMDLINE[0]) {
      |                                               ^~~~~~~~~~~~~~~~~~~~
1 error generated.

Fixes: 83da30d73b86 ("LoongArch: Fix CMDLINE_EXTEND and CMDLINE_BOOTLOADER handling")
Co-developed-by: Wentao Guan <guanwentao@xxxxxxxxxxxxx>
Signed-off-by: Wentao Guan <guanwentao@xxxxxxxxxxxxx>
Signed-off-by: Yuli Wang <wangyuli@xxxxxxxxxxxxx>
---
 arch/loongarch/kernel/setup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/loongarch/kernel/setup.c b/arch/loongarch/kernel/setup.c
index edcfdfcad7d2..834bea7f42da 100644
--- a/arch/loongarch/kernel/setup.c
+++ b/arch/loongarch/kernel/setup.c
@@ -332,7 +332,7 @@ static void __init bootcmdline_init(char **cmdline_p)
 	 * Append built-in command line to the bootloader command line if
 	 * CONFIG_CMDLINE_EXTEND is enabled.
 	 */
-	if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) && CONFIG_CMDLINE[0]) {
+	if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) && !!CONFIG_CMDLINE[0]) {
 		strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 		strlcat(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
 	}
-- 
2.47.2