Fix warnings in libs/binder.

Test: mm
Change-Id: Ia1387dcfbc789914c4fba80193f4e36d60fec88e
diff --git a/libs/binder/Parcel.cpp b/libs/binder/Parcel.cpp
index 8087443..8dab98e 100644
--- a/libs/binder/Parcel.cpp
+++ b/libs/binder/Parcel.cpp
@@ -2285,7 +2285,7 @@
         ssize_t written = TEMP_FAILURE_RETRY(
             ::write(comm, &message, sizeof(message)));
 
-        if (written == -1 || written != sizeof(message)) {
+        if (written != sizeof(message)) {
             ALOGW("Failed to detach ParcelFileDescriptor written: %zd err: %s",
                 written, strerror(errno));
             return BAD_TYPE;