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[objdump] Avoid error in stderr about strings with -1

-1 is used to mark empty strings.

--- a/objdump/main.c

+++ b/objdump/main.c

@@ -1,6 +1,7 @@

 #include <errno.h>

 #include <limits.h>

+#include <stdint.h>

 #include <stdio.h>

 #include <stdlib.h>

 #include <string.h>

@@ -16,7 +17,8 @@

 {

 	size_t n;

-	

+	if ((int32_t) off == -1)

+		return "";

 	if (off < SIZE_MAX) {

 		for (n = off; n < strsiz && strings[n]; ++n)

 			;