[kvm-unit-tests PATCH 1/2] s390x: Only run genprotimg if necessary

[Nicholas Piggin <npiggin@gmail.com>]

genprotimg is not required if the --host-key-document= configure option
is not specified, so avoid running it in that case. This prevents the
build message:

  bash: line 1: genprotimg: command not found

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 s390x/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/s390x/Makefile b/s390x/Makefile
index 19c41a2ec..c6518bbd1 100644
--- a/s390x/Makefile
+++ b/s390x/Makefile
@@ -213,12 +213,16 @@ $(comm-key):
 
 # The genprotimg arguments for the cck changed over time so we need to
 # figure out which argument to use in order to set the cck
+ifneq ($(HOST_KEY_DOCUMENT),)
 GENPROTIMG_HAS_COMM_KEY = $(shell $(GENPROTIMG) --help | grep -q -- --comm-key && echo yes)
 ifeq ($(GENPROTIMG_HAS_COMM_KEY),yes)
 	GENPROTIMG_COMM_OPTION := --comm-key
 else
 	GENPROTIMG_COMM_OPTION := --x-comm-key
 endif
+else
+GENPROTIMG_HAS_COMM_KEY =
+endif
 
 ifeq ($(CONFIG_DUMP),yes)
 	# allow dumping + PCKMO
-- 
2.43.0