Remove various bits of lint.

Change-Id: I5f8f61766d2add7fd7ff40d463ea03cb20515988
diff --git a/src/context.h b/src/context.h
index 75eb8ca..292ac84 100644
--- a/src/context.h
+++ b/src/context.h
@@ -37,7 +37,7 @@
 
 class VmapTable {
  public:
-  VmapTable(const uint16_t* table) : table_(table) {
+  explicit VmapTable(const uint16_t* table) : table_(table) {
   }
 
   uint16_t operator[](size_t i) const {