[matter] always check for preserved libs, even when --gentle is not specified

services/matter

@@ -1022,6 +1022,13 @@ Environment variables passed to --pkgpre/--pkgpost executables:
 
         with EntropyResourceLock(entropy_server, nsargs.blocking):
 
+            preserved_libs = \
+                PackageBuilder.check_preserved_libraries()
+            if preserved_libs:
+                print_error(
+                    "preserved libraries are found on system, aborting.")
+                raise SystemExit(7)
+
             if nsargs.gentle:
                 # check if there is something to do
                 to_be_added, to_be_removed, to_be_injected = \
@@ -1041,13 +1048,6 @@ Environment variables passed to --pkgpre/--pkgpost executables:
                         "some configuration files have to be merged manually")
                     raise SystemExit(6)
 
-                preserved_libs = \
-                    PackageBuilder.check_preserved_libraries()
-                if preserved_libs:
-                    print_error(
-                        "preserved libraries are found on system, aborting.")
-                    raise SystemExit(7)
-
             # setup
             if nsargs.pre:
                 rc = PackageBuilder.setup(nsargs.pre, cwd)