Fix glibc-compat msync retval.
Fix glibc-compat msync retval.

This changes the return value to be -1, as
specified in man msync to indicate error,
and uses the macro for ENOSYS.

BUG=
R=sbc@chromium.org

Review URL: https://codereview.chromium.org/261013012

git-svn-id: 84b3587ce119b778414dcb50e18b7479aacf4f1d@1259 7dad1e8b-422e-d2af-fbf5-8013b78bd812

kuscsik/naclports,dtkav/naclports,kosyak/naclports_samsung-smart-tv,dtkav/naclports,binji/naclports,yeyus/naclports,kosyak/naclports_samsung-smart-tv,kosyak/naclports_samsung-smart-tv,yeyus/naclports,dtkav/naclports,Schibum/naclports,binji/naclports,yeyus/naclports,Schibum/naclports,binji/naclports,yeyus/naclports,Schibum/naclports,yeyus/naclports,Schibum/naclports,Schibum/naclports,kosyak/naclports_samsung-smart-tv,yeyus/naclports,kuscsik/naclports,kosyak/naclports_samsung-smart-tv,dtkav/naclports,kuscsik/naclports,binji/naclports,Schibum/naclports,kuscsik/naclports,binji/naclports,kuscsik/naclports,dtkav/naclports