selftests/powerpc: Add NX-GZIP engine decompress testcase

Include a decompression testcase for the powerpc NX-GZIP
engine.
Signed-off-by: Bulent Abali <abali@us.ibm.com>
Signed-off-by: Raphael Moreira Zinsly <rzinsly@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200420205538.25181-5-rzinsly@linux.ibm.com

tools/testing/selftests/powerpc/nx-gzip/Makefile

 CFLAGS = -O3 -m64 -I./include
 
-TEST_GEN_FILES := gzfht_test
+TEST_GEN_FILES := gzfht_test gunz_test
 TEST_PROGS := nx-gzip-test.sh
 
 include ../../lib.mk

tools/testing/selftests/powerpc/nx-gzip/nx-gzip-test.sh

@@ -26,6 +26,7 @@ function test_sizes
 		echo "Testing $size ($n) ..."
 		dd if=/dev/urandom of=$fname bs=$size count=1
 		./gzfht_test $fname
+		./gunz_test ${fname}.nx.gz
 	done
 }