Finish prefixing regs struct names with arch_

* defs: Rename regs -> sparc_regs.
* signal.c (sys_sigreturn): Use new variable name.
* syscall.c: Rename regs -> sparc_regs, regs -> avr32_regs.
(getrval2): Use new variable names.
(printcall): Likewise.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/signal.c b/signal.c
index 11d49d3..227b149 100644
--- a/signal.c
+++ b/signal.c
@@ -911,7 +911,7 @@
 		long i1;
 		m_siginfo_t si;
 		sigset_t sigm;
-		i1 = regs.u_regs[U_REG_O1];
+		i1 = sparc_regs.u_regs[U_REG_O1];
 		if (umove(tcp, i1, &si) < 0) {
 			perror_msg("%s", "sigreturn: umove");
 			return 0;