Print "SECCOMP_FILE not specified" instead of "failed to load (null)".

Signed-off-by: Michal Sojka <sojk...@fel.cvut.cz>
---
 jail/preload.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/jail/preload.c b/jail/preload.c
index 5466f27..24358c6 100644
--- a/jail/preload.c
+++ b/jail/preload.c
@@ -27,6 +27,11 @@ static int __preload_main__(int argc, char **argv, char 
**envp)
 {
        char *env_file = getenv("SECCOMP_FILE");
 
+       if (!env_file || !env_file[0]) {
+               ERROR("SECCOMP_FILE not specified\n");
+               return -1;
+       }
+
        if (install_syscall_filter(*argv, env_file))
                return -1;
 
-- 
2.14.1


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