patch: reindent code

mercurial/patch.py

@@ -1149,10 +1149,11 b' def iterhunks(fp):'
                 yield 'file', (afile, bfile, h, gp and gp.mode or None)
             yield 'hunk', h
         elif x.startswith('diff --git'):
-            # check for git diff, scanning the whole patch file if needed
             m = gitre.match(x)
-            if m:
+            if not m:
+                continue
                 if not git:
+                # scan whole input for git metadata
                     git = True
                     gitpatches = scangitpatch(lr, x)
                     for gp in gitpatches: