Remove the extra parenthesis from the cv_init() macro. They are not

necessary because we already use parenthesis in zfs_cv_init().

This fixes a long standing bug where there would be an extra ")" at the
end of the string. This extra parenthesis would show up in the WCHAN of
the process (top, stty status, etc.).

sys/cddl/compat/opensolaris/sys/kcondvar.h

@@ -55,7 +55,7 @@ typedef enum {
 		_name = #cv;						\
 	cv_init((cv), _name);						\
 } while (0)
-#define	cv_init(cv, name, type, arg)	zfs_cv_init((cv), (name), (type), (arg))
+#define	cv_init(cv, name, type, arg)	zfs_cv_init(cv, name, type, arg)
 
 #endif	/* _KERNEL */