Fix warnings about shadowed variables.

ir/be/beemitter.h

@@ -102,8 +102,8 @@ static inline size_t be_emit_get_column(void)
 	be_emit_char('\t'); \
 	if (in_delay_slot) \
 		be_emit_char(' '); \
-	for (size_t n;;) \
-		if (n = strcspn(fmt, "\n%"), be_emit_string_len(fmt, n), fmt += n, *fmt == '\0') { \
+	for (size_t node##__n;;) \
+		if (node##__n = strcspn(fmt, "\n%"), be_emit_string_len(fmt, node##__n), fmt += node##__n, *fmt == '\0') { \
 			be_emit_finish_line_gas(node); \
 			va_end(ap); \
 			break; \

ir/be/sparc/sparc_emitter.c

@@ -586,7 +586,7 @@ void sparc_emitf(ir_node const *const node, char const *fmt, ...)
 			}
 			break;
 
-		case 'O':
+		case 'O': {
 			if (!is_digit(*fmt))
 				goto unknown;
 			unsigned const pos = *fmt++ - '0';
@@ -597,6 +597,7 @@ void sparc_emitf(ir_node const *const node, char const *fmt, ...)
 			if (!plus)
 				be_emit_char(']');
 			break;
+		}
 
 		case 'R': {
 			arch_register_t const *const reg = va_arg(ap, const arch_register_t*);