Fix nanosleep in BootAnimation

clock_nanosleep will return 0 or error no directly.

Bug: 207149564
Test: Build ok
Change-Id: I15866728719d0672a16b4a76a8fd3be4d53d420a

cmds/bootanimation/BootAnimation.cpp

@@ -1348,7 +1348,7 @@ bool BootAnimation::playAnimation(const Animation& animation) {
                     int err;
                     do {
                         err = clock_nanosleep(CLOCK_MONOTONIC, TIMER_ABSTIME, &spec, nullptr);
-                    } while (err<0 && errno == EINTR);
+                    } while (err == EINTR);
                 }
 
                 checkExit();