mesa: s/height/depth/ in texsubimage()

Fixes http://bugs.freedesktop.org/show_bug.cgi?id=37648

src/mesa/main/teximage.c

@@ -2693,7 +2693,7 @@ texsubimage(struct gl_context *ctx, GLuint dims, GLenum target, GLint level,
                                   format, type, texImage)) {
          /* error was recorded */
       }
-      else if (width > 0 && height > 0 && height > 0) {
+      else if (width > 0 && height > 0 && depth > 0) {
          /* If we have a border, offset=-1 is legal.  Bias by border width. */
          switch (dims) {
          case 3: