perf trace: Fix up error path indentation

Trivial fix removing a tab in an error path.

Link: http://lkml.kernel.org/n/tip-c14mk6cqaiby8gf5rpft3d9r@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-trace.c

@@ -1663,7 +1663,7 @@ static int trace__vfs_getname(struct trace *trace, struct perf_evsel *evsel,
 		char *f = realloc(ttrace->filename.name, filename_len + 1);
 
 		if (f == NULL)
-				goto out;
+			goto out;
 
 		ttrace->filename.namelen = filename_len;
 		ttrace->filename.name = f;