pppd: Fix compile warning due to comparing pointer to NUL character

Evidently this means to check for arg pointing to an empty string,
not arg being NULL, since the ensuing error talks about the variable
name being missing.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

diff --git a/pppd/options.c b/pppd/options.c
index 482dce69e666467a5dc1feef08703b7a50802caf..5db580a0e270c0628fb99d1400423599a1f0ce5e 100644 (file)
--- a/pppd/options.c
+++ b/pppd/options.c
@@ -1753,7 +1753,7 @@ user_unsetenv(argv)
        option_error("unexpected = in name: %s", arg);
        return 0;
     }
-    if (arg == '\0') {
+    if (*arg == '\0') {
        option_error("missing variable name for unset");
        return 0;
     }