Fixed RunCommandDropRoot when running as Shell.

BUG: 26379932
BUG: 31807540

Test: mmm -j32 frameworks/native/cmds/dumpstate/ && adb push ${ANDROID_PRODUCT_OUT}/data/nativetest/dumpstate_test* /data/nativetest&& adb unroot && adb shell /data/nativetest/dumpstate_test/dumpstate_test

Change-Id: Id582f5fbd4d6282a2eacce602ae1a6d1f62d5c61
diff --git a/cmds/dumpstate/utils.cpp b/cmds/dumpstate/utils.cpp
index a9118b1..36006af 100644
--- a/cmds/dumpstate/utils.cpp
+++ b/cmds/dumpstate/utils.cpp
@@ -925,7 +925,7 @@
 
 bool drop_root_user() {
     if (getgid() == AID_SHELL && getuid() == AID_SHELL) {
-        MYLOGD("drop_root_user(): already running as Shell");
+        MYLOGD("drop_root_user(): already running as Shell\n");
         return true;
     }
     /* ensure we will keep capabilities when we drop root */