tasm frontend: Fix crash with plain /l option.

svn path=/trunk/yasm/; revision=2135

diff --git a/frontends/tasm/tasm.c b/frontends/tasm/tasm.c
index 695681ff7579e9918284095c2baaee2974e44a81..5431f580e5c8c140b16069ada73ea569c0e9cbf3 100644 (file)
--- a/frontends/tasm/tasm.c
+++ b/frontends/tasm/tasm.c
@@ -718,7 +718,7 @@ opt_ignore(/*@unused@*/ char *cmd, /*@unused@*/ char *param, int extra)
 static int
 opt_listing_handler(/*@unused@*/ char *cmd, /*@unused@*/ char *param, int extra)
 {
-    if (param[0]) {
+    if (param && param[0]) {
         if (param[0] != 'a')
             return 1;
         expanded_listing = 1;