docs/125751: man 3 pthread_getschedparam section ERRORS incomplete

[Bruce Cran]

According to POSIX EINVAL isn't a valid return value, which is why it's not 
documented. It appears that if the parameters are NULL 0 is expected to be 
returned; in glibc on Linux if both are NULL then 0 is returned otherwise if 
just one is NULL then a segfault occurs. 

I'd like to commit the attached patch which I think brings the implementation 
more in-line with POSIX: return 0 if either parameters are NULL and return 
ESRCH from functions which search for a pthread_t if a thread doesn't exist 
regardless of whether it's NULL or otherwise.

-- 
Bruce Cran
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