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Backport !1794 “gio-tool-info: Prevent criticals if mount options are not available” to glib-2-66

Philip Withnall requested to merge pwithnall/glib:backport-1794-gio-tool-critical-glib-2-66 into glib-2-66

NULL is valid return value for the g_unix_mount_get_options function because mount options are currently provided only by libmount implementation. However, the gio tool passes the returned value to the g_strescape function without checking, which produces the following critical warning: GLib-CRITICAL **: 13:47:15.294: g_strescape: assertion 'source != NULL' failed

Let's add the missing check to prevent the critical warnings.

Trivial backport of !1794 (merged) to glib-2-66.

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