[PATCH bpf] bpf, libbpf: fix quiet install_headers

[Daniel Borkmann <daniel@xxxxxxxxxxxxx>]

Both btf.h and xsk.h headers are not installed quietly due to
missing '\' for the call to QUIET_INSTALL. Lets fix it.

Before:

  # make install_headers
    INSTALL  headers
  if [ ! -d '''/usr/local/include/bpf' ]; then install -d -m 755 '''/usr/local/include/bpf'; fi; install btf.h -m 644 '''/usr/local/include/bpf';
  if [ ! -d '''/usr/local/include/bpf' ]; then install -d -m 755 '''/usr/local/include/bpf'; fi; install xsk.h -m 644 '''/usr/local/include/bpf';
  # ls /usr/local/include/bpf/
  bpf.h  btf.h  libbpf.h  xsk.h

After:

  # make install_headers
    INSTALL  headers
  # ls /usr/local/include/bpf/
  bpf.h  btf.h  libbpf.h  xsk.h

Fixes: a493f5f9d8c2 ("libbpf: Install btf.h with libbpf")
Fixes: 379e2014c95b ("libbpf: add xsk.h to install_headers target")
Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
---
 tools/lib/bpf/Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
index 7beec4d..8e7c56e 100644
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile
@@ -220,8 +220,8 @@ install_lib: all_cmd
 install_headers:
 	$(call QUIET_INSTALL, headers) \
 		$(call do_install,bpf.h,$(prefix)/include/bpf,644); \
-		$(call do_install,libbpf.h,$(prefix)/include/bpf,644);
-		$(call do_install,btf.h,$(prefix)/include/bpf,644);
+		$(call do_install,libbpf.h,$(prefix)/include/bpf,644); \
+		$(call do_install,btf.h,$(prefix)/include/bpf,644); \
 		$(call do_install,xsk.h,$(prefix)/include/bpf,644);
 
 install: install_lib
-- 
2.9.5