Use unary operator instead of == bool

Automatically generated with coccinelle:

@@
expression e1;
@@

-e1 == false
+!e1

@@
expression e1;
@@

-false == e1
+!e1

@@
expression e1;
@@

-e1 == true
+e1

@@
expression e1;
@@

-true == e1
+e1

Test: build
Change-Id: Ic7df0dc43b550594855e457466b6bccd8f3443a3