[PATCH] lib/oe/patch.py: Fix patch resolver logic

[Richard Purdie <richard.purdie@linuxfoundation.org>]

Currently, if PATCHRESOLVE is user and and PatchTree() is being used, you can
get backtraces if patch applcication fails. This is because even in the failure
case, self._current is incremented, meaning second time around, there are array
range issues.

This patch changes the code so _current is only incremented upon successful
patch application, thereby resolving this failure.

[YOCTO #2043 partially]

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---
diff --git a/meta/lib/oe/patch.py b/meta/lib/oe/patch.py
index 6f7f900..065a8f7 100644
--- a/meta/lib/oe/patch.py
+++ b/meta/lib/oe/patch.py
@@ -134,20 +134,23 @@ class PatchTree(PatchSet):
         bb.note("patches is %s" % self.patches)
         if all:
             for i in self.patches:
+                bb.note("applying patch %s" % i)
+                self._applypatch(i, force)
+
                 if self._current is not None:
                     self._current = self._current + 1
                 else:
                     self._current = 0
-                bb.note("applying patch %s" % i)
-                self._applypatch(i, force)
         else:
+            bb.note("applying patch %s" % self.patches[self._current or 0])
+            ret = self._applypatch(self.patches[self._current or 0], force)
+
             if self._current is not None:
                 self._current = self._current + 1
             else:
                 self._current = 0
-            bb.note("applying patch %s" % self.patches[self._current])
-            return self._applypatch(self.patches[self._current], force)
 
+            return ret
 
     def Pop(self, force = None, all = None):
         if all: