verify: use some intermediate variables instead of a multi-liner

This is shorter and easier to read as the indentation remains the same.

We extract the long message in a module level constant for clarity.

Differential Revision: https://phab.mercurial-scm.org/D10810

mercurial/verify.py

@@ -38,6 +38,11 b' def _normpath(f):'
     return f
 
 
+HINT_FNCACHE = _(
+    b'hint: run "hg debugrebuildfncache" to recover from corrupt fncache\n'
+)
+
+
 class verifier(object):
     def __init__(self, repo, level=None):
         self.repo = repo.unfiltered()
@@ -202,12 +207,7 b' class verifier(object):'
         if self.warnings:
             ui.warn(_(b"%d warnings encountered!\n") % self.warnings)
         if self.fncachewarned:
-            ui.warn(
-                _(
-                    b'hint: run "hg debugrebuildfncache" to recover from '
-                    b'corrupt fncache\n'
-                )
-            )
+            ui.warn(HINT_FNCACHE)
         if self.errors:
             ui.warn(_(b"%d integrity errors encountered!\n") % self.errors)
             if self.badrevs: