[igraph] Use a valid shell command

[Pierre-YvesChibon]

commit c3bfdfb29a5085aafae2ad105a8b06f5bdb92207
Author: Pierre-Yves Chibon <pingou at pingoured.fr>
Date:   Mon Dec 9 22:22:59 2013 +0100

    Use a valid shell command

 igraph.spec |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/igraph.spec b/igraph.spec
index df289d8..f62a794 100644
--- a/igraph.spec
+++ b/igraph.spec
@@ -55,7 +55,7 @@ find . -name '.arch-ids' | xargs rm -rf
 rm -rf $RPM_BUILD_ROOT
 
 %check
-make check || 1
+make check || true
 cat tests/testsuite.log