Merge branch 'tb/git-mv-icase-fix'

Fix a corner case bug in "git mv" on case insensitive systems,
which was introduced in 2.29 timeframe.

* tb/git-mv-icase-fix:
  git mv foo FOO ; git mv foo bar gave an assert
diff --git a/builtin/mv.c b/builtin/mv.c
index 7dac714..3fccdcb 100644
--- a/builtin/mv.c
+++ b/builtin/mv.c
@@ -221,7 +221,7 @@
 				}
 				argc += last - first;
 			}
-		} else if (!(ce = cache_file_exists(src, length, ignore_case))) {
+		} else if (!(ce = cache_file_exists(src, length, 0))) {
 			bad = _("not under version control");
 		} else if (ce_stage(ce)) {
 			bad = _("conflicted");