[MacPorts] #63010: libsdl2_gfx clean fails

[MacPorts]

#63010: libsdl2_gfx clean fails
--------------------------+-------------------------
 Reporter:  ShadSterling  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.7.1
 Keywords:                |       Port:  libsdl2_gfx
--------------------------+-------------------------
 `port clean libsdl2_gfx` gives output `Error: Unable to open port: wrong #
 args: should be "llength list"`

 This stopped `port clean installed` from cleaning subsequent ports

 `clean` doesn't seem to have any option to show more detail, so I don't
 know what else to report.

 I'd Cc maintainers, but `port info libsdl2_gfx` fails with the same error.

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Ticket URL: <https://trac.macports.org/ticket/63010>
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