[PATCH for-next 1/2] selftests/Makefile: Create BUILD_TARGET directory for INSTALL_DEP_TARGETS

[Li Zhijian]

Similar to 'all' which will create BUILD_TARGET for TARGETS, we should
create BUILD_TARGET directory for INSTALL_DEP_TARGETS before generate
the binaries.

This helps to fix the following error for net target during
kselftest-install:
$ make O=$build/ kselftest-install TARGETS=net V=1
...
/usr/bin/ld: cannot open output file $O/kselftest/net/lib/csum: No such file or directory

Signed-off-by: Li Zhijian <lizhijian@xxxxxxxxxxx>
---
 tools/testing/selftests/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index 2401e973c359..fcaebd122d64 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -263,6 +263,7 @@ ifdef INSTALL_PATH
 	@ret=1;	\
 	for TARGET in $(TARGETS) $(INSTALL_DEP_TARGETS); do \
 		BUILD_TARGET=$$BUILD/$$TARGET;	\
+		mkdir $$BUILD_TARGET -p;			\
 		$(MAKE) OUTPUT=$$BUILD_TARGET -C $$TARGET install \
 				INSTALL_PATH=$(INSTALL_PATH)/$$TARGET \
 				SRC_PATH=$(shell readlink -e $$(pwd)) \
-- 
2.44.0