blackfin,kgdb: Do not put PC in gdb_regs into retx.

In blackfin, kgdb is running in delayed exception IRQ5 other than in
exception IRQ3 directly.  Register reti other than retx in pt_regs is
the kgdb return address. So, don't put PC in gdb_regs into retx.

CC: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Sonic Zhang <sonic.adi@gmail.com>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>

arch/blackfin/kernel/kgdb.c

@@ -133,7 +133,7 @@ void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
 	regs->lb1 = gdb_regs[BFIN_LB1];
 	regs->usp = gdb_regs[BFIN_USP];
 	regs->syscfg = gdb_regs[BFIN_SYSCFG];
-	regs->retx = gdb_regs[BFIN_PC];
+	regs->retx = gdb_regs[BFIN_RETX];
 	regs->retn = gdb_regs[BFIN_RETN];
 	regs->rete = gdb_regs[BFIN_RETE];
 	regs->pc = gdb_regs[BFIN_PC];