st/dri/sw: Fix pitch calculation in drisw_update_tex_buffer

swrastGetImage rounds the pitch up to 4 bytes for compatibility reasons
that are explained in drisw_glx.c:bytes_per_line, so drisw_update_tex_buffer
must do the same.

Fixes window skew seen while running firefox over vnc on a 16-bit screen.

NOTE: This is a candidate for the stable branches.

[ajax: fixed typo in comment]

Reviewed-by: Stéphane Marchesin <[email protected]>
Signed-off-by: Richard Sandiford <[email protected]>

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