fix: nxstyle: fix a bug after "'\'"

When nxstyle.c detects a "\'", it seeks the other "\'", records the index as "endndx", then skip the "'x'". But it makes the index "n" as "endndx+1".Then it comes to the "n++" in "for()". So the character after "'x'" will be skipped, causing some errors.
For example, "{"devid", no_argument, NULL, 'i'},", the "}" will be skipped, causing a lot of error reports.
Now it's fixed.

Signed-off-by: liucheng5 <liucheng5@xiaomi.com>

tools/nxstyle.c

@@ -2270,7 +2270,7 @@ int main(int argc, char **argv, char **envp)
                                  endndx++);
                           }
 
-                        n = endndx + 1;
+                        n = endndx;
                       }
                   }
                   break;