Trivial cleanup of recent changes.

A typo in the documentation for one, and a couple of signed/unsigned warnings
in the implementation of the other.

Change-Id: I8fb4b7448ac901c543dea7420aabcedf13ec1bd8
diff --git a/init/readme.txt b/init/readme.txt
index 132a869..e5406ed 100644
--- a/init/readme.txt
+++ b/init/readme.txt
@@ -123,7 +123,7 @@
    Triggers of this form occur when the property <name> is set
    to the specific value <value>.
 
-   One can also test Mutliple properties to execute a group
+   One can also test multiple properties to execute a group
    of commands. For example:
 
    on property:test.a=1 && property:test.b=1