umount.c: make use of RVAL_DECODED
umount.c: make use of RVAL_DECODED

* umount.c (sys_umount2): Update for RVAL_DECODED.

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