Add test to improve coverage of CheckIO::checkWrongPrintfScanfArguments()

test/testio.cpp

@@ -1948,6 +1948,14 @@ private:
             check(code, false, false, Settings::Win64);
             ASSERT_EQUALS(result_win64, errout.str());
         }
+        {
+            check("void g() {\n"
+                  "    const char c[]=\"42\";\n"
+                  "    scanf(\"%s\n\", c);\n"
+                  "}\n");
+            ASSERT_EQUALS("[test.cpp:3]: (warning) %s in format string (no. 1) requires a 'char *' but the argument type is 'const char *'.\n"
+                          "[test.cpp:3]: (warning) scanf without field width limits can crash with huge input data.\n", errout.str());
+        }
 
     }