st/mesa: fix sampler_view REALLOC/FREE macro mix-up

We were using REALLOC() from u_memory.h but FREE() from imports.h.
This mismatch caused us to trash the heap on Windows after we
deleted a texture object.

This fixes a regression from commit 6c59be7776e4d.

Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>
3 files changed