Fix a warning

./tcpdump.c:1951:13: warning: assigning to 'char *' from 'const char [7]'
discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
                        username = WITH_USER;
                                 ^ ~~~~~~~~~

1 files changed, 1 insertions, 1 deletions

diff --git a/tcpdump.c b/tcpdump.c
index 9e6a2995..e8394c0b 100644
--- a/tcpdump.c
+++ b/tcpdump.c
@@ -1446,7 +1446,7 @@ main(int argc, char **argv)
 	u_char *pcap_userdata;
 	char ebuf[PCAP_ERRBUF_SIZE];
 	char VFileLine[PATH_MAX + 1];
-	char *username = NULL;
+	const char *username = NULL;
 #ifndef _WIN32
 	const char *chroot_dir = NULL;
 #endif