[PATCH] obsolete: fix grammar

[timeless]

# HG changeset patch
# User timeless <timeless at mozdev.org>
# Date 1464326685 0
#      Fri May 27 05:24:45 2016 +0000
# Node ID eadac5f317556589fd5f8825699a219f1d09c09d
# Parent  ee12963f197ecc14be5c55c329af42e566e24d07
# Available At https://bitbucket.org/timeless/mercurial-crew
#              hg pull https://bitbucket.org/timeless/mercurial-crew -r eadac5f31755
obsolete: fix grammar

diff -r ee12963f197e -r eadac5f31755 mercurial/obsolete.py
--- a/mercurial/obsolete.py	Thu May 26 16:50:59 2016 +0000
+++ b/mercurial/obsolete.py	Fri May 27 05:24:45 2016 +0000
@@ -1171,7 +1171,7 @@
                                    ignoreflags=bumpedfix):
             prev = torev(pnode) # unfiltered! but so is phasecache
             if (prev is not None) and (phase(repo, prev) <= public):
-                # we have a public precursors
+                # we have a public precursor
                 bumped.add(rev)
                 break # Next draft!
     return bumped