Fixed unused param warnings for check-lost+found

A few simple warnings fixed to produce a clean clang build.

Change-Id: I9484f860903a80e4c91e204e7e6738145535f642
Author: Edwin Vane <edwin.vane@intel.com>
Reviewed-by: Ariel J Bernal <ariel.j.bernal@intel.com>

tools/ota/check-lost+found.c

@@ -44,7 +44,7 @@ static const char *kPartitions[] = { "/system", "/data", "/cache", NULL };
  * 2. Write a log entry with the number of files in lost+found directories.
  */
 
-int main(int argc, char **argv) {
+int main(int argc __attribute__((unused)), char **argv __attribute__((unused))) {
     mkdir(kOutputDir, 0755);
     chown(kOutputDir, AID_SYSTEM, AID_SYSTEM);
     FILE *out = fopen(kOutputFile, "a");