buffer overflow

Index: gcl.c
--- gcl.c.orig
+++ gcl.c
@@ -925,7 +925,7 @@ static int lexanal(void) {
 
 			if (env && *env) {
 				strncpy(lexbuffer, env, LBSIZE-1);
-				lexbuffer[LBSIZE] = '\0';
+				lexbuffer[LBSIZE-1] = '\0';
 			}
 			else
 				lexbuffer[0] = '\0';