xf86-driver-savage: (3/3) Fix ambiguous operator precedence

[Alex Villací­s Lasso]

In the modified lines, the logical-not binds first to psav->videoFlags, 
not to (psav->videoFlags & VF_STREAMS_ON). If more flags are ever 
implemented, they could interfere with this check. More of a preventive 
patch than anything else.

Changelog:
* Add parentheses to clarify intended meaning of boolean check.

-- 
perl -e '$x=2.4;print sprintf("%.0f + %.0f = %.0f\n",$x,$x,$x+$x);'

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