[PATCH 3/4] read-tree.c: rework UI when merging no trees

[Jean-Noel Avila]

The initial test was inherited from a previous commit, but it is no
longer needed, given the following switch case. Moreover, the question
sentence ending the program has been replace by an assertative one.

Signed-off-by: Jean-Noel Avila <jn.av...@free.fr>
---
 builtin/read-tree.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/builtin/read-tree.c b/builtin/read-tree.c
index 23e212ee8..05296997c 100644
--- a/builtin/read-tree.c
+++ b/builtin/read-tree.c
@@ -226,9 +226,10 @@ int cmd_read_tree(int argc, const char **argv, const char 
*unused_prefix)
                setup_work_tree();
 
        if (opts.merge) {
-               if (stage < 2)
-                       die("just how do you expect me to merge %d trees?", 
stage-1);
                switch (stage - 1) {
+               case 0:
+                       die("there are no trees to merge!");
+                       break;
                case 1:
                        opts.fn = opts.prefix ? bind_merge : oneway_merge;
                        break;
-- 
2.12.0