Fix uninitialized vars in EnumDeclaration

'protection' and 'parent' are used in ScopeDSymbol::search
detected by Valgrind). The assignment in semantic0 is enough to
fix the bug, but I also added an initialization to the constructor.

This is a backport of DMD commit 4dfaf02d4d by Don Clugston.

dmd2/enum.c

@@ -38,6 +38,8 @@ EnumDeclaration::EnumDeclaration(Loc loc, Identifier *id, Type *memtype)
 #if IN_DMD
     objFileDone = 0;
 #endif
+    protection = PROTundefined;
+    parent = NULL;
 }
 
 Dsymbol *EnumDeclaration::syntaxCopy(Dsymbol *s)
@@ -79,6 +81,10 @@ void EnumDeclaration::semantic0(Scope *sc)
 
     if (isdone || !scope)
         return;
+
+    parent = scope->parent;
+    protection = scope->protection;
+
     if (!isAnonymous() || memtype)
         return;
     for (size_t i = 0; i < members->dim; i++)