[PATCH] perf build: Remove stray '\' before that is warned about since grep 3.8

[Arnaldo Carvalho de Melo <acme@kernel.org>]

To address this grep 3.8 warning:

  grep: warning: stray \ before #

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/Makefile.perf | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 456872ac410df4c0..25d5ccaec22a44fe 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -361,7 +361,7 @@ python-clean := $(call QUIET_CLEAN, python) $(RM) -r $(PYTHON_EXTBUILD) $(OUTPUT
 ifeq ($(CONFIG_LIBTRACEEVENT),y)
   PYTHON_EXT_SRCS := $(shell grep -v ^\# util/python-ext-sources)
 else
-  PYTHON_EXT_SRCS := $(shell grep -v '^\#\|util/trace-event.c' util/python-ext-sources)
+  PYTHON_EXT_SRCS := $(shell grep -v '^#\|util/trace-event.c' util/python-ext-sources)
 endif
 
 PYTHON_EXT_DEPS := util/python-ext-sources util/setup.py $(LIBAPI)
-- 
2.41.0