Uninitialized var: Fixed false negatives for self assignment

lib/checkuninitvar.cpp

@@ -1685,6 +1685,9 @@ bool CheckUninitVar::isVariableUsage(const Token *vartok, bool pointer, bool cpp
         }
     }
 
+    if (Token::Match(vartok->previous(), "= %var% ;|%cop%"))
+        return true;
+
     bool unknown = false;
     if (pointer && CheckNullPointer::isPointerDeRef(vartok, unknown)) {
         // function parameter?

test/testuninitvar.cpp

@@ -2081,6 +2081,12 @@ private:
                         "}");
         ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: x\n", errout.str());
 
+        checkUninitVar2("int f() {\n"
+                        "    int x;\n"
+                        "    x = x;\n"
+                        "}");
+        ASSERT_EQUALS("[test.cpp:3]: (error) Uninitialized variable: x\n", errout.str());
+
         checkUninitVar2("void f() {\n"
                         "    struct ABC *abc;\n"
                         "    abc->a = 0;\n"