signalfd, signalfd4: mark return code with RVAL_FD flag
signalfd, signalfd4: mark return code with RVAL_FD flag

* signalfd.c (do_signalfd): Set RVAL_FD flag in the return code.

kapdop/android_external_strace,Saruta/strace,cuviper/strace,cuviper/strace,cuviper/strace,Distrotech/strace,vrastogi/strace,vrastogi/strace,vrastogi/strace,Distrotech/strace,Saruta/strace,vrastogi/strace,Distrotech/strace,kapdop/android_external_strace,Saruta/strace,cuviper/strace,cuviper/strace,Saruta/strace,vrastogi/strace,Distrotech/strace,Saruta/strace,kapdop/android_external_strace,Distrotech/strace,kapdop/android_external_strace,kapdop/android_external_strace