Fixed false positive useClosedFile when noreturn function is called (#7359)

Author: PKEuS

lib/checkio.cpp

@@ -148,7 +148,7 @@ void CheckIO::checkFileUsage()
                         i->second.lastOperation = Filepointer::UNKNOWN_OP;
                     }
                 }
-            } else if (tok->str() == "return" || tok->str() == "continue" || tok->str() == "break") { // Reset upon return, continue or break
+            } else if (tok->str() == "return" || tok->str() == "continue" || tok->str() == "break" || _settings->library.isnoreturn(tok)) { // Reset upon return, continue or break
                 for (std::map<unsigned int, Filepointer>::iterator i = filepointers.begin(); i != filepointers.end(); ++i) {
                     i->second.mode_indent = 0;
                     i->second.mode = UNKNOWN_OM;

test/testio.cpp

@@ -480,6 +480,18 @@ class TestIO : public TestFixture {
               "}");
         ASSERT_EQUALS("", errout.str());
 
+        check("void chdcd_parse_nero(FILE *infile) {\n"
+              "    switch (mode) {\n"
+              "        case 0x0300:\n"
+              "            fclose(infile);\n"
+              "            exit(0);\n"
+              "        case 0x0500:\n"
+              "            fclose(infile);\n"
+              "            return;\n"
+              "    }\n"
+              "}");
+        ASSERT_EQUALS("", errout.str());
+
         // #4649
         check("void foo() {\n"
               "    struct {FILE *f1; FILE *f2;} a;\n"