updated for version 7.2.375
Problem:    ml_get errors when using ":bprevious" in a BufEnter autocmd.
            (Dominique Pelle)
Solution:   Clear w_valid when entering another buffer.
diff --git a/src/buffer.c b/src/buffer.c
index a3cd6be..0569f16 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -115,7 +115,7 @@
 #endif
 
     /* mark cursor position as being invalid */
-    changed_line_abv_curs();
+    curwin->w_valid = 0;
 
     if (curbuf->b_ffname != NULL
 #ifdef FEAT_NETBEANS_INTG
@@ -1399,6 +1399,9 @@
     curwin->w_topline_was_set = FALSE;
 #endif
 
+    /* mark cursor position as being invalid */
+    curwin->w_valid = 0;
+
     /* Make sure the buffer is loaded. */
     if (curbuf->b_ml.ml_mfp == NULL)	/* need to load the file */
     {