gcc 8 reports bug: division ‘sizeof (int *) / sizeof (int)’ does not compute the number of array elements

[lacker]

hpguppi_coherent_bf_thread.c: In function ‘safe_close_all’:
hpguppi_coherent_bf_thread.c:57:29: error: division ‘sizeof (int *) / sizeof (int)’ does not compute the number of array elements [-Werror=sizeof-pointer-div]
   int pfd_size = sizeof(pfd)/sizeof(int);
                             ^
hpguppi_coherent_bf_thread.c:55:32: note: first ‘sizeof’ operand was declared here
 static int safe_close_all(int *pfd) {
                           ~~~~~^~~
cc1: all warnings being treated as errors

hpguppi_proc/src/hpguppi_coherent_bf_thread.c

Line 57 in 4c09934

int pfd_size = sizeof(pfd)/sizeof(int);

gcc 8 throws a warning/error on this bit of code. I think it is correctly identifying an error here - this doesn't actually calculate the size of pfd, which I think will cause it to leave files open.