nvme_manage: Rely on fgets to NULL terminate string

fgets guarantees that strings returned are NULL terminated,
so delete logic that attempts to insert a NULL terminator.

Change-Id: Ibeadcda9af431091b04daff41596d5738419b43f
Signed-off-by: Ziye Yang <ziye.yang@intel.com>

examples/nvme/nvme_manage/nvme_manage.c

@@ -786,7 +786,6 @@ update_firmware_image(void)
 		while (getchar() != '\n');
 		return;
 	}
-	path[strlen(path) - 1] = '\0';
 
 	fd = open(path, O_RDONLY);
 	if (fd < 0) {