t4201: make use of abbreviation in the test more robust

diff --git a/builtin/merge-file.c b/builtin/merge-file.c
index 55447053f2dde004ceffff9967b015b4a01c35d1..13e22a2f0be73ec7e521a02d1f36c414e77a8700 100644 (file)
--- a/builtin/merge-file.c
+++ b/builtin/merge-file.c
@@ -62,8 +62,7 @@ int cmd_merge_file(int argc, const char **argv, const char *prefix)
                usage_with_options(merge_file_usage, options);
        if (quiet) {
                if (!freopen("/dev/null", "w", stderr))
-                       return error("failed to redirect stderr to /dev/null: "
-                                    "%s", strerror(errno));
+                       return error_errno("failed to redirect stderr to /dev/null");
        }
 
        if (prefix)
@@ -95,12 +94,13 @@ int cmd_merge_file(int argc, const char **argv, const char *prefix)
                FILE *f = to_stdout ? stdout : fopen(fpath, "wb");
 
                if (!f)
-                       ret = error("Could not open %s for writing", filename);
+                       ret = error_errno("Could not open %s for writing",
+                                         filename);
                else if (result.size &&
                         fwrite(result.ptr, result.size, 1, f) != 1)
-                       ret = error("Could not write to %s", filename);
+                       ret = error_errno("Could not write to %s", filename);
                else if (fclose(f))
-                       ret = error("Could not close %s", filename);
+                       ret = error_errno("Could not close %s", filename);
                free(result.ptr);
        }