Fix gcc-4.6 warning.  This is a also fixed in upstream.

Change-Id: I48d060c0e59466e3cd4a824d698199f7b181e6b6
https://code.ros.org/trac/opencv/changeset/5473#file15
diff --git a/cv/src/cvinpaint.cpp b/cv/src/cvinpaint.cpp
index fbf471c..705612b 100644
--- a/cv/src/cvinpaint.cpp
+++ b/cv/src/cvinpaint.cpp
@@ -103,7 +103,7 @@
         for (i=1; i<=num; i++) {
             mem[i].prev   = mem+i-1;
             mem[i].next   = mem+i+1;
-            mem[i].i      = mem[i].i = -1;
+            mem[i].i      = -1;
             mem[i].T      = FLT_MAX;
         }
         tail       = mem+i;