module/Makefile.in: don't run xargs if empty
If stdin if empty - don't run xargs command, otherwise we can get `cp: missing file operand` error. Reviewed-by: Ryan Moeller <ryan@ixsystems.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: George Melikov <mail@gmelikov.ru> Closes #9418
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@ -68,7 +68,7 @@ distdir:
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list='$(obj-m)'; for objdir in $$list; do \
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(cd @top_srcdir@/module && find $$objdir \
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-name '*.c' -o -name '*.h' -o -name '*.S' | \
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xargs cp --parents -t @abs_top_builddir@/module/$$distdir); \
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xargs -r cp --parents -t @abs_top_builddir@/module/$$distdir); \
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done
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distclean maintainer-clean: clean
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