Factor out option variables from int to bool types

Change-Id: Ia897aa43e44d115bde6de91789b35723826ace22
diff --git a/adb_install.h b/adb_install.h
index a18b712..efad436 100644
--- a/adb_install.h
+++ b/adb_install.h
@@ -19,6 +19,6 @@
 
 class RecoveryUI;
 
-int apply_from_adb(RecoveryUI* h, int* wipe_cache, const char* install_file);
+int apply_from_adb(RecoveryUI* h, bool* wipe_cache, const char* install_file);
 
 #endif