requester: Mark pldm_close() as LIBPLDM_ABI_TESTING

pldm_close() exists in the implementation but isn't exposed in the
corresponding header. As there should be no current users of it, take
the opportunity to remove it from the stable ABI.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: I11f50a8bd39d7113bf97bc32a34d0556233afa14
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ae66275..9fb57b4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,10 @@
 
 ## [Unreleased]
 
+### Changed
+
+1. requester: Mark pldm_close() as LIBPLDM_ABI_TESTING
+
 ### Removed
 
 1. bios_table: Remove deprecated APIs sanitized by assert():
diff --git a/src/requester/pldm.c b/src/requester/pldm.c
index 78e1e52..8fd5d38 100644
--- a/src/requester/pldm.c
+++ b/src/requester/pldm.c
@@ -170,7 +170,7 @@
 
 /* Adding this here for completeness in the case we can't smoothly
  * transition apps over to the new api */
-LIBPLDM_ABI_STABLE
+LIBPLDM_ABI_TESTING
 void pldm_close(void)
 {
 	if (open_transport) {