Allow one-character package name

Test: hidl_test, one-character package
Change-Id: Ic0cae5f6f71faf442b8ead38e969bef2af21bef8
diff --git a/Coordinator.cpp b/Coordinator.cpp
index 063d679..96d8a44 100644
--- a/Coordinator.cpp
+++ b/Coordinator.cpp
@@ -273,7 +273,7 @@
 
         startPos = dotPos + 1;
     }
-    CHECK_LT(startPos + 1, packageSuffix.length());
+    CHECK_LT(startPos, packageSuffix.length());
     packagePath.append(packageSuffix.substr(startPos));
     packagePath.append("/");