xfree86: use OsBlockSIGIO from the ddx

We can ignore the "wasset" argument now since the DIX will keep proper
refcounting.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Keith Packard <keithp@keithp.com>

hw/xfree86/os-support/shared/sigio.c

@@ -259,26 +259,13 @@ xf86RemoveSIGIOHandler(int fd)
 int
 xf86BlockSIGIO(void)
 {
-    sigset_t set, old;
+    return OsBlockSIGIO();
-    int ret;
-
-    sigemptyset(&set);
-    sigaddset(&set, SIGIO);
-    sigprocmask(SIG_BLOCK, &set, &old);
-    ret = sigismember(&old, SIGIO);
-    return ret;
 }
 
 void
 xf86UnblockSIGIO(int wasset)
 {
-    sigset_t set;
+    OsReleaseSIGIO();
-
-    if (!wasset) {
-        sigemptyset(&set);
-        sigaddset(&set, SIGIO);
-        sigprocmask(SIG_UNBLOCK, &set, NULL);
-    }
 }
 
 void