drm-intel: Assert that the bo is unmapped upon release.

Check through error paths to catch a few more places where the mapped bo
may have been leaked, and add an assert to abort in case we do leak a
mapping.

src/drm/cairo-drm-i915-spans.c

@@ -612,6 +612,9 @@ i915_spans_fini (i915_spans_t *spans)
 {
     i915_shader_fini (&spans->shader);
 
+    if (spans->tail->bo->virtual)
+	intel_bo_unmap (spans->tail->bo);
+
     if (spans->head.bo != NULL) {
 	struct vbo *vbo, *next;
 

src/drm/cairo-drm-i965-glyphs.c

@@ -448,6 +448,10 @@ i965_surface_glyphs (void			*abstract_surface,
     cairo_device_release (surface->intel.drm.base.device);
   CLEANUP_GLYPHS:
     i965_shader_fini (&glyphs.shader);
+
+    if (glyphs.tail->bo->virtual)
+	intel_bo_unmap (glyphs.tail->bo);
+
     if (glyphs.head.bo != NULL) {
 	struct i965_vbo *vbo, *next;
 

src/drm/cairo-drm-i965-spans.c

@@ -344,6 +344,9 @@ i965_spans_fini (i965_spans_t *spans)
 {
     i965_shader_fini (&spans->shader);
 
+    if (spans->tail->bo->virtual)
+	intel_bo_unmap (spans->tail->bo);
+
     if (spans->head.bo != NULL) {
 	struct i965_vbo *vbo, *next;
 

src/drm/cairo-drm-intel.c

@@ -491,6 +491,8 @@ intel_bo_release (void *_dev, void *_bo)
     intel_bo_t *bo = _bo;
     int bucket;
 
+    assert (bo->virtual == NULL);
+
     bucket = INTEL_BO_CACHE_BUCKETS;
     if (bo->base.size & -bo->base.size)
 	bucket = ffs (bo->base.size / 4096) - 1;
@@ -982,8 +984,10 @@ intel_glyph_cache_add_glyph (intel_device_t *device,
 
 	if (width > (int) sizeof (buf)) {
 	    a8 = malloc (width);
-	    if (unlikely (a8 == NULL))
+	    if (unlikely (a8 == NULL)) {
+		intel_bo_unmap (cache->buffer.bo);
 		return _cairo_error (CAIRO_STATUS_NO_MEMORY);
+	    }
 	}
 
 	dst += node->x;