camera: fix torch value write function, used for video torch

(sizeof vs strlen)

Change-Id: Ie9d102652c4787c49730ee22ce89539ff3144899

libcamera/JordanCameraWrapper.cpp

@@ -99,7 +99,7 @@ setSocTorchMode(bool enable)
     int fd = ::open("/sys/class/leds/torch-flash/flash_light", O_WRONLY);
     if (fd >= 0) {
         const char *value = enable ? "100" : "0";
-        write(fd, value, sizeof(value));
+        write(fd, value, strlen(value));
         close(fd);
     }
 }