Change sscanf to atoi in test-debug.cc to make lint happy.

test/cctest/test-debug.cc

Index: test/cctest/test-debug.cc
===================================================================
--- test/cctest/test-debug.cc	(revision 3048)
+++ test/cctest/test-debug.cc	(working copy)
@@ -3567,7 +3567,7 @@
     return -1;
   }
   int res = -1;
-  sscanf(pos + strlen(value), "%d", &res);
+  res = atoi(pos + strlen(value));
   return res;
 }
 
@@ -3580,7 +3580,7 @@
     return -1;
   }
   int res = -1;
-  sscanf(pos + strlen(breakpoints), "%d", &res);
+  res = atoi(pos + strlen(breakpoints));
   return res;
 }