- repo_arch: make it work with empty prefixes

diff --git a/ext/repo_arch.c b/ext/repo_arch.c
index dfa2ac8..5151803 100644 (file)
--- a/ext/repo_arch.c
+++ b/ext/repo_arch.c
@@ -256,7 +256,7 @@ static int gettarhead(struct tarhead *th)
              memcpy(prefix, th->blk + 345, 155);
              prefix[155] = 0;
              l = strlen(prefix);
-             if (prefix[l - 1] == '/')
+             if (l && prefix[l - 1] == '/')
                prefix[l - 1] = 0;
              th->path = solv_dupjoin(prefix, "/", path);
            }