sd-id128: rename and export sd_id128_string_equal()

We find this function useful in our code, so no reason not to export it.
I changed the order of last two words in the name to match the arguments.
(With "equal_string" I expected sd_id128_t first, string second, but in
actual use, the second argument is usually a long constant so it's nice
to keep this order of arguments.)

src/libsystemd/libsystemd.sym

@@ -783,6 +783,8 @@ LIBSYSTEMD_252 {
 global:
         sd_bus_error_setfv;
 
+        sd_id128_string_equal;
+
         sd_hwdb_new_from_path;
 
         sd_netlink_new_from_fd;

src/libsystemd/sd-id128/id128-util.c

@@ -206,19 +206,3 @@ int id128_get_product(sd_id128_t *ret) {
         *ret = uuid;
         return 0;
 }
-
-int id128_equal_string(const char *s, sd_id128_t id) {
-        sd_id128_t parsed;
-        int r;
-
-        if (!s)
-                return false;
-
-        /* Checks if the specified string matches a valid string representation of the specified 128 bit ID/uuid */
-
-        r = sd_id128_from_string(s, &parsed);
-        if (r < 0)
-                return r;
-
-        return sd_id128_equal(parsed, id);
-}

src/libsystemd/sd-id128/id128-util.h

@@ -34,5 +34,3 @@ extern const struct hash_ops id128_hash_ops;
 sd_id128_t id128_make_v4_uuid(sd_id128_t id);
 
 int id128_get_product(sd_id128_t *ret);
-
-int id128_equal_string(const char *s, sd_id128_t id);

src/libsystemd/sd-id128/sd-id128.c

@@ -101,6 +101,22 @@ _public_ int sd_id128_from_string(const char s[], sd_id128_t *ret) {
         return 0;
 }
 
+_public_ int sd_id128_string_equal(const char *s, sd_id128_t id) {
+        sd_id128_t parsed;
+        int r;
+
+        if (!s)
+                return false;
+
+        /* Checks if the specified string matches a valid string representation of the specified 128 bit ID/uuid */
+
+        r = sd_id128_from_string(s, &parsed);
+        if (r < 0)
+                return r;
+
+        return sd_id128_equal(parsed, id);
+}
+
 _public_ int sd_id128_get_machine(sd_id128_t *ret) {
         static thread_local sd_id128_t saved_machine_id = {};
         int r;