Fix qemu endless loop when raising a SIGSEGV/SIGBUS signal with gdbstub in user emulation

When a SIGSEGV signal is raised in user mode emulation the current
test to know whether the signal is sent by the kernel is wrong :

info->si_code == SI_KERNEL

according to /usr/include/bits/siginfo.h it should be

info->si_code > 0
Signed-off-by: NLionel Landwerlin <lionel.landwerlin@openwide.fr>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6151 c046a42c-6fe2-441c-8c8c-71466251a162

linux-user/signal.c

@@ -441,9 +441,9 @@ static void host_signal_handler(int host_signum, siginfo_t *info,
     target_siginfo_t tinfo;
 
     /* the CPU emulator uses some host signals to detect exceptions,
-       we we forward to it some signals */
+       we forward to it some signals */
     if ((host_signum == SIGSEGV || host_signum == SIGBUS)
-        && info->si_code == SI_KERNEL) {
+        && info->si_code > 0) {
         if (cpu_signal_handler(host_signum, info, puc))
             return;
     }