[committed] Silence warning in verify_edges

[Tom de Vries <tdevries@suse.de>]

Hi,

Since commit ad77fcd "Improve --devel-verify-edges" we're running into this
warning:
...
dwz.c: In function ‘verify_edges’:
dwz.c:6615:12: warning: ‘ipu’ may be used uninitialized in this function\
  [-Wmaybe-uninitialized]
   for (ipu = ipu->next; ipu; ipu = ipu->next)
        ~~~~^~~~~~~~~~~
...

Fix this by initializing ipu in verify_edges.

Committed to trunk.

Thanks,
- Tom

Silence warning in verify_edges

2019-12-05  Tom de Vries  <tdevries@suse.de>

	* dwz.c (verify_edges): Initialize ipu to NULL before the first loop,
	and assert it's no longer NULL after the first loop.

---
 dwz.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/dwz.c b/dwz.c
index 6f88b82..6b45ad3 100644
--- a/dwz.c
+++ b/dwz.c
@@ -6547,6 +6547,7 @@ verify_edges (struct import_cu **ipus, unsigned int npus, unsigned int ncus)
   oc = 0;
 
   /* Verify initial PUs.  */
+  ipu = NULL;
   for (i = 0; i < npus; ++i)
     {
       ipu = ipus[i];
@@ -6556,6 +6557,7 @@ verify_edges (struct import_cu **ipus, unsigned int npus, unsigned int ncus)
     }
 
   /* Verify new PUs.  */
+  assert (ipu != NULL);
   for (ipu = ipu->next; ipu; ipu = ipu->next)
     verify_edges_1 (ipu, &ic, &oc);