perf symbols: Use the right variable to check for kallsyms in the cache

Probably this wasn't noticed when testing this on my parisc
machine because I must have copied manually to its cache the
vmlinux file used in the x86_64 machine, now that I tried
looking on a x86-32 machine with a fresh cache, kernel symbols
weren't being resolved even with the right kallsyms copy on its
cache, duh.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1264178102-4203-2-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

tools/perf/util/symbol.c

@@ -1650,12 +1650,12 @@ static int dso__load_kernel_sym(struct dso *self, struct map *map,
 			     getenv("HOME"), sbuild_id) == -1)
 			return -1;
 
+		kallsyms_filename = kallsyms_allocated_filename;
+
 		if (access(kallsyms_filename, F_OK)) {
 			free(kallsyms_allocated_filename);
 			return -1;
 		}
-
-		kallsyms_filename = kallsyms_allocated_filename;
 	} else {
 		/*
 		 * Last resort, if we don't have a build-id and couldn't find