Fix uninitialized warning, and work around a bug in gcc over clobbering

Summary:
r329077 caused gcc to emit uninitialized use warnings.  Attempting to
fix those warnings yielded the following warnings:

usr.bin/tftp/main.c: In function 'main':
usr.bin/tftp/main.c:181: warning: variable 'el' might be clobbered by
'longjmp' or 'vfork'
usr.bin/tftp/main.c:182: warning: variable 'hist' might be clobbered by
'longjmp' or 'vfork'

This is a known bug in gcc, found at
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=24239

Work around that by simply marking hist and el as static.

Reviewed by:	imp
Differential Revision:	https://reviews.freebsd.org/D14302

1 files changed, 2 insertions, 2 deletions

diff --git a/usr.bin/tftp/main.c b/usr.bin/tftp/main.c
index b76fbe3192a7..b7972add4008 100644
--- a/usr.bin/tftp/main.c
+++ b/usr.bin/tftp/main.c
@@ -178,8 +178,8 @@ int
 main(int argc, char *argv[])
 {
 	HistEvent he;
-	EditLine *el;
-	History *hist;
+	static EditLine *el;
+	static History *hist;
 	bool interactive;
 
 	acting_as_client = 1;