Fix #14661 Regression while handling arrays of function pointers (cppcheck-opensource#8436)

Regression introduced in PR cppcheck-opensource#8402.

Author: mptre

lib/checkunusedvar.cpp

@@ -738,7 +738,9 @@ void CheckUnusedVar::checkFunctionVariableUsage_iterateScopes(const Scope* const
             if (type == Variables::none || isPartOfClassStructUnion(i->typeStartToken()))
                 continue;
             const Token* defValTok = i->nameToken()->next();
-            if (Token::Match(i->nameToken()->previous(), "* %var% ) (")) // function pointer. Jump behind parameter list.
+            while (defValTok && defValTok->str() == "[")
+                defValTok = defValTok->link()->next();
+            if (Token::simpleMatch(defValTok, ") ("))
                 defValTok = defValTok->linkAt(1)->next();
             for (; defValTok; defValTok = defValTok->next()) {
                 if (defValTok->str() == "[")

test/testunusedvar.cpp

@@ -7034,6 +7034,13 @@ class TestUnusedVar : public TestFixture {
                               "    funcPtr();\n"
                               "}");
         ASSERT_EQUALS("", errout_str());
+
+        // #14661
+        functionVariableUsage("int main() {\n"
+                              "    void (*const funcPtr[])(void) = {x};\n"
+                              "    funcPtr[0]();\n"
+                              "}");
+        ASSERT_EQUALS("", errout_str());
     }
 
     void localvarAddr() { // #7747