video: fbdev: sis: Drop useless call to SiS_GetResInfo()

Coverity reported:

    Useless call (USELESS_CALL) side_effect_free: Calling
     SiS_GetResInfo(SiS_Pr, ModeNo, ModeIdIndex) is only useful for its
    return value, which is ignored.

And this is correct - so drop the call.

Signed-off-by: Sam Ravnborg <[email protected]>
Reported-by: Colin Ian King <[email protected]>
Addresses-Coverity: ("Useless call")
Acked-by: Thomas Zimmermann <[email protected]>
Cc: Colin Ian King <[email protected]>
Cc: Thomas Winischhofer <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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