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Fix operand size issues in syscalls.

    Er. I really should do something WRT 'foo.len' calls.

--- a/sys-linux.myr

+++ b/sys-linux.myr

@@ -391,7 +391,7 @@

 const close	= {fd;			-> syscall(Sysclose, fd);}

 const creat	= {path, mode;		-> syscall(Syscreat, path castto(char*), mode);}

 const read	= {fd, buf;		-> syscall(Sysread, fd, buf castto(char*), buf.len);}

-const write	= {fd, buf;		-> syscall(Syswrite, fd, buf castto(char*), buf.len);}

+const write	= {fd, buf;		-> syscall(Syswrite, fd, buf castto(char*), buf.len castto(size));}

 const lseek	= {fd, off, whence;	-> syscall(Syslseek, fd, off, whence);}

 const fstat	= {fd, sb;		-> syscall(Sysfstat, fd, sb);}

 const munmap	= {addr, len;		-> syscall(Sysmunmap, addr, len);}

-- 

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