lib/hexdump: Drop redundant isprint() implementation

Change-Id: I23e2d89274553cbc75e42f0420a1a84d4cec4340
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32739
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

src/lib/hexdump.c

@@ -14,11 +14,7 @@
 
 #include <console/console.h>
 #include <lib.h>
-
-static int isprint(int c)
-{
-	return (c >= 32 && c <= 126);
-}
+#include <string.h>
 
 void hexdump(const void *memory, size_t length)
 {