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/defs.h b/defs.h
index f92d025..1cc5d0f 100644
--- a/defs.h
+++ b/defs.h
@@ -360,7 +360,7 @@
 extern long ia32;
 #endif
 #if defined(SPARC) || defined(SPARC64)
-extern struct pt_regs regs;
+extern struct pt_regs sparc_regs;
 #endif
 #if defined(ARM)
 extern struct pt_regs arm_regs;