Remove unreachable code in DexLocationToOdexFilename.

Test: test-art-host
Change-Id: I855a58e18fba66555576cc663f4c0631b9dc4ac6
diff --git a/runtime/oat_file_assistant.cc b/runtime/oat_file_assistant.cc
index 3396ce0..db6f8ee 100644
--- a/runtime/oat_file_assistant.cc
+++ b/runtime/oat_file_assistant.cc
@@ -640,15 +640,8 @@
   std::string dir = location.substr(0, pos+1);
   dir += "oat/" + std::string(GetInstructionSetString(isa));
 
-  // Find the file portion of the dex location.
-  std::string file;
-  if (pos == std::string::npos) {
-    file = location;
-  } else {
-    file = location.substr(pos+1);
-  }
-
   // Get the base part of the file without the extension.
+  std::string file = location.substr(pos+1);
   pos = file.rfind('.');
   if (pos == std::string::npos) {
     *error_msg = "Dex location " + location + " has no extension.";