svga: move some assignments in svga_texture_transfer_map()
svga: move some assignments in svga_texture_transfer_map()

Put near other assignments to the svga_transfer variable.

Reviewed-by: Neha Bhende <faec1a32a2d2624ef91f92ce8eed261ff4162c00@vmware.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler