[vala] linux: make backtrace_symbols return unowned

[Evan Nemerson <evann src gnome org>]

commit f402af94e8471c8314ee7a312260a776e4d6fbe2
Author: Evan Nemerson <evan coeus-group com>
Date:   Sat Sep 15 11:14:54 2012 -0700

    linux: make backtrace_symbols return unowned
    
    You are supposed to free() the result of backtrace_symbols, but not
    each element in the array.  The current binding will free each element
    which will likely result in a crash.  Since we don't currently support
    owned arrays of unowned values (bug #571486), making the whole thing
    unowned and leaking (unless you call free manually) is the best we can
    do right now.

 vapi/linux.vapi |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/vapi/linux.vapi b/vapi/linux.vapi
index 199ee80..da424d5 100644
--- a/vapi/linux.vapi
+++ b/vapi/linux.vapi
@@ -1029,7 +1029,7 @@ namespace Linux {
     public int backtrace (void* buffer, int size);
 
     [CCode (cheader_filename = "execinfo.h", array_length = false)]
-    public string[] backtrace_symbols (void* buffer, int size);
+    public unowned string[] backtrace_symbols (void* buffer, int size);
 
     [CCode (cheader_filename = "execinfo.h")]
     public void backtrace_symbols_fd (void* buffer, int size, int fd);