seedrng: code shrink

Struct initializers do this double init:
># util-linux/seedrng.c:88:              struct pollfd random_fd = {
        movl    $0, 132(%esp)   #, random_fd
        movl    $0, 136(%esp)   #, random_fd
...
># util-linux/seedrng.c:88:              struct pollfd random_fd = {
        movl    %eax, 140(%esp) # _110, random_fd.fd
        movw    $1, 144(%esp)   #, random_fd.events

and close(random_fd.fd) needs to pull the item from the stack:
        pushl   132(%esp)       # random_fd.fd
        call    close   #

function                                             old     new   delta
seedrng_main                                        1076    1050     -26

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 5 insertions, 5 deletions

diff --git a/util-linux/seedrng.c b/util-linux/seedrng.c
index 5559ba77c..023ed8688 100644
--- a/util-linux/seedrng.c
+++ b/util-linux/seedrng.c
@@ -85,14 +85,14 @@ static bool read_new_seed(uint8_t *seed, size_t len)
                 return true;
         }
         if (ret < 0 && errno == ENOSYS) {
-                struct pollfd random_fd = {
-                        .fd = xopen("/dev/random", O_RDONLY),
-                        .events = POLLIN
-                };
+                int fd = xopen("/dev/random", O_RDONLY);
+                struct pollfd random_fd;
+                random_fd.fd = fd;
+                random_fd.events = POLLIN;
                 is_creditable = poll(&random_fd, 1, 0) == 1;
 //This is racy. is_creditable can be set to true here, but other process
 //can consume "good" random data from /dev/urandom before we do it below.
-                close(random_fd.fd);
+                close(fd);
         } else {
                 if (getrandom(seed, len, GRND_INSECURE) == (ssize_t)len)
                         return false;