execute: free syscall_log hashmap when done

Fixes #35394

(cherry picked from commit c3dc460)
(cherry picked from commit f15fd96)
(cherry picked from commit a9c650b)

Author: dtardon

src/core/execute.c

@@ -6225,6 +6225,7 @@ void exec_context_done(ExecContext *c) {
 
         c->syscall_filter = hashmap_free(c->syscall_filter);
         c->syscall_archs = set_free(c->syscall_archs);
+        c->syscall_log = hashmap_free(c->syscall_log);
         c->address_families = set_free(c->address_families);
 
         for (ExecDirectoryType t = 0; t < _EXEC_DIRECTORY_TYPE_MAX; t++)