winspool.drv/tests: Fix the spelling of a variable name.

dlls/winspool.drv/tests/info.c

@@ -2679,7 +2679,7 @@ static void test_DocumentProperties(void)
     LONG dm_size, ret;
     DEVMODEA *dm;
     char empty_str[] = "";
-    char non_existing_str[] = "non existing printer";
+    char nonexistent_str[] = "nonexistent printer";
 
     if (!default_printer)
     {
@@ -2708,7 +2708,7 @@ static void test_DocumentProperties(void)
     ret = DocumentPropertiesA(0, hprn, empty_str, dm, dm, DM_OUT_BUFFER);
     ok(ret == IDOK, "DocumentPropertiesA ret value %ld != expected IDOK\n", ret);
 
-    ret = DocumentPropertiesA(0, hprn, non_existing_str, dm, dm, DM_OUT_BUFFER);
+    ret = DocumentPropertiesA(0, hprn, nonexistent_str, dm, dm, DM_OUT_BUFFER);
     ok(ret == IDOK, "DocumentPropertiesA ret value %ld != expected IDOK\n", ret);
 
     test_DEVMODEA(dm, dm_size, default_printer);