Fix a bunch of lint.

There are still about 1800 lint warnings, so don't get too excited...

Change-Id: I2394bd6e750b94060231378b3a7a88b87f70c757
diff --git a/src/class_linker.cc b/src/class_linker.cc
index 47beadb..f891913 100644
--- a/src/class_linker.cc
+++ b/src/class_linker.cc
@@ -844,7 +844,7 @@
   OatFile* oat_file = OpenOat(space);
   CHECK(oat_file != NULL) << "Failed to open oat file for image";
   CHECK_EQ(oat_file->GetOatHeader().GetImageFileLocationChecksum(), 0U);
-  CHECK(oat_file->GetOatHeader().GetImageFileLocation() == "");
+  CHECK(oat_file->GetOatHeader().GetImageFileLocation().empty());
   Object* dex_caches_object = space->GetImageHeader().GetImageRoot(ImageHeader::kDexCaches);
   ObjectArray<DexCache>* dex_caches = dex_caches_object->AsObjectArray<DexCache>();