libstagefright: track libziparchive API change.

One last user of the StartIteration ZipString overload...

Bug: http://b/129068177
Test: builds
Change-Id: I6b2619211372b20a721c800452cb7c63105c111e
Merged-In: I723570315285d7c2caadffd71cd2d15efde11819
diff --git a/media/libstagefright/MediaExtractorFactory.cpp b/media/libstagefright/MediaExtractorFactory.cpp
index b0bf269..3597a4d 100644
--- a/media/libstagefright/MediaExtractorFactory.cpp
+++ b/media/libstagefright/MediaExtractorFactory.cpp
@@ -223,10 +223,8 @@
         char abi[PROPERTY_VALUE_MAX];
         property_get("ro.product.cpu.abi", abi, "arm64-v8a");
         String8 prefix8 = String8::format("lib/%s/", abi);
-        ZipString prefix(prefix8.c_str());
-        ZipString suffix("extractor.so");
         void* cookie;
-        ret = StartIteration(zipHandle, &cookie, &prefix, &suffix);
+        ret = StartIteration(zipHandle, &cookie, prefix8.c_str(), "extractor.so");
         if (ret == 0) {
             ZipEntry entry;
             ZipString name;