Jeff Smith 3e377e238f glamor: fix repeat-reflect case in linear gradient shader
If _pt_distance is negative, it causes the final distance to be negative
in the repeat-reflect case.  Moving the scaling by _pt_distance earlier
avoids this problem, and simplifies some equations as a bonus.

Bugzilla: https://bugs.freedesktop.org/98508
Signed-off-by: Jeff Smith <whydoubt@gmail.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
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