fileset: add missing whitespace around operator stable

fileset: add missing whitespace around operator

--- a/mercurial/fileset.py	Sat Jun 18 20:49:07 2011 -0500
+++ b/mercurial/fileset.py	Sun Jun 19 11:43:40 2011 +0200
@@ -305,7 +305,7 @@
     elif expr[0].isdigit or expr[0] == '.':
         a = _sizetoint(expr)
         b = _sizetomax(expr)
-        m = lambda x: x >=a and x <= b
+        m = lambda x: x >= a and x <= b
     else:
         raise error.ParseError(_("couldn't parse size"), expr)