Bug 1410969 - Properly resolve wildcards in `mach file-info`; r=ahal

I likely regressed this as part of e9416a307987 (bug 1397406).

Before this change, '*' in filenames didn't work.

MozReview-Commit-ID: 33m83H6UTZ

--HG--
extra : rebase_source : 5732cd2b7f4851c6cd564c8dcbd7d303fbad570b

python/mozbuild/mozbuild/frontend/mach_commands.py

@@ -187,7 +187,11 @@ class MozbuildFileCommands(MachCommandBase):
             if rev:
                 raise InvalidPathException('cannot use wildcard in version control mode')
 
-            for path, f in reader.finder.find(p):
+            # finder is rooted at / for now.
+            # TODO bug 1171069 tracks changing to relative.
+            search = mozpath.join(self.topsrcdir, p)[1:]
+            for path, f in reader.finder.find(search):
+                path = path[len(self.topsrcdir):]
                 if path not in all_paths_set:
                     all_paths_set.add(path)
                     allpaths.append(path)