libcutils: turn on -Werror

- Deal with some -Wunused / -Wunused-variable issues

Change-Id: I28c23fb213382a392ec30935749fb359e072d664
diff --git a/libcutils/str_parms.c b/libcutils/str_parms.c
index 953b91d..2e3ce9f 100644
--- a/libcutils/str_parms.c
+++ b/libcutils/str_parms.c
@@ -25,10 +25,9 @@
 #include <string.h>
 
 #include <cutils/hashmap.h>
-#include <cutils/log.h>
 #include <cutils/memory.h>
-
 #include <cutils/str_parms.h>
+#include <log/log.h>
 
 #define UNUSED __attribute__((unused))
 
@@ -374,8 +373,6 @@
 
 int main(void)
 {
-    struct str_parms *str_parms;
-
     test_str_parms_str("");
     test_str_parms_str(";");
     test_str_parms_str("=");