Fix function names in CHECK_NON_NULL_ARGUMENT.

Fixes a copy paste error that leads to confusing
JNI error logs.

Change-Id: I27af4e1b206e84d28590c50e38d4f718af2405e9
diff --git a/runtime/jni_internal.cc b/runtime/jni_internal.cc
index 6f31ca7..94ae89e 100644
--- a/runtime/jni_internal.cc
+++ b/runtime/jni_internal.cc
@@ -2029,7 +2029,7 @@
   }
 
   static const jchar* GetStringChars(JNIEnv* env, jstring java_string, jboolean* is_copy) {
-    CHECK_NON_NULL_ARGUMENT(GetStringUTFRegion, java_string);
+    CHECK_NON_NULL_ARGUMENT(GetStringChars, java_string);
     ScopedObjectAccess soa(env);
     String* s = soa.Decode<String*>(java_string);
     CharArray* chars = s->GetCharArray();
@@ -2048,7 +2048,7 @@
   }
 
   static void ReleaseStringChars(JNIEnv* env, jstring java_string, const jchar* chars) {
-    CHECK_NON_NULL_ARGUMENT(GetStringUTFRegion, java_string);
+    CHECK_NON_NULL_ARGUMENT(ReleaseStringChars, java_string);
     delete[] chars;
     ScopedObjectAccess soa(env);
     UnpinPrimitiveArray(soa, soa.Decode<String*>(java_string)->GetCharArray());