delta: warn if diff failed

Found by Coverity. Fixes CID #1237541.

1 files changed, 4 insertions, 2 deletions

diff --git a/src/delta/delta.c b/src/delta/delta.c
index 91f8592b4..2fdbeeae8 100644
--- a/src/delta/delta.c
+++ b/src/delta/delta.c
@@ -159,7 +159,7 @@ static int notify_override_unchanged(const char *f) {
 
 static int found_override(const char *top, const char *bottom) {
         _cleanup_free_ char *dest = NULL;
-        int k;
+        int k, r;
         pid_t pid;
 
         assert(top);
@@ -194,7 +194,9 @@ static int found_override(const char *top, const char *bottom) {
                 _exit(1);
         }
 
-        wait_for_terminate(pid, NULL);
+        r = wait_for_terminate(pid, NULL);
+        if (r < 0)
+                log_warning("Failed to wait for diff: %s", strerror(-r));
 
         putchar('\n');