setrlimit/getrlimit: Use __nonnull to avoid null pointer

setrlimit/getrlimit: Use __nonnull to avoid null pointer

Add __nonnull((2)) to the setrlimit()/getrlimit() function declaration
to avoid null pointer access.

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v2
  According to the suggestions of the Adhemerval Zanella and Zack Weinberg:
    use __nonnull() to check null pointers in the compilation phase.
    do not add pointer check code to setrlimit()/getrlimit().
    The validity of the "resource" parameter is checked in the syscall.
v1
  https://public-inbox.org/libc-alpha/20201230114131.47589-1-nixiaoming@huawei.com/
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Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>