selftests: forwarding: mirror_gre_flower: Fix test result handling

The global variable RET needs to be initialized before each call to
log_test. This test case sets it once before running the tests, but then
calls log_tests for every individual test. Thus a failure in one of the
tests causes spurious failures in follow-up tests as well.

Fix by moving the initialization of RET from test_all() to
full_test_span_gre_dir_acl(), a function that implements the test.

Signed-off-by: Petr Machata <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

tools/testing/selftests/net/forwarding/mirror_gre_flower.sh

···
 	local match_dip=$1; shift
 	local what=$1; shift
 
+	RET=0
+
 	mirror_install $swp1 $direction $tundev \
 		       "protocol ip flower $tcflags dst_ip $match_dip"
 	fail_test_span_gre_dir $tundev $direction
···
 
 test_all()
 {
-	RET=0
-
 	slow_path_trap_install $swp1 ingress
 	slow_path_trap_install $swp1 egress