[PATCH] perf Documentation: Fix out-of-tree asciidoctor man page generation

[Ben Hutchings]

The dependency for the man page rule using asciidoctor incorrectly
specifies a source file in $(OUTPUT).  When building out-of-tree, the
source file is not found, resulting in a fall-back to the following
rule which uses xmlto.

Fixes: ffef80ecf89f ("perf Documentation: Support for asciidoctor")
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
--- a/tools/perf/Documentation/Makefile
+++ b/tools/perf/Documentation/Makefile
@@ -285,7 +285,7 @@ $(MAN_HTML): $(OUTPUT)%.html : %.txt
 	mv $@+ $@
 
 ifdef USE_ASCIIDOCTOR
-$(OUTPUT)%.1 $(OUTPUT)%.5 $(OUTPUT)%.7 : $(OUTPUT)%.txt
+$(OUTPUT)%.1 $(OUTPUT)%.5 $(OUTPUT)%.7 : %.txt
 	$(QUIET_ASCIIDOC)$(RM) $@+ $@ && \
 	$(ASCIIDOC) -b manpage -d manpage \
 		$(ASCIIDOC_EXTRA) -aperf_version=$(PERF_VERSION) -o $@+ $< && \

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