patch 8.0.0291: Visual block insertion does not insert in all lines

Problem:    Visual block insertion does not insert in all lines.
Solution:   Don't bail out of insert too early. Add a test. (Christian
            Brabandt, closes #1290)
diff --git a/src/ops.c b/src/ops.c
index 0a48912..1c0276d 100644
--- a/src/ops.c
+++ b/src/ops.c
@@ -2571,8 +2571,7 @@
     }
 
     t1 = oap->start;
-    if (edit(NUL, FALSE, (linenr_T)count1))
-	return;
+    (void)edit(NUL, FALSE, (linenr_T)count1);
 
     /* When a tab was inserted, and the characters in front of the tab
      * have been converted to a tab as well, the column of the cursor