convert.c: guard config parser from value=NULL

filter.*.smudge and filter.*.clean configuration variables expect a
string value.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/convert.c b/convert.c
index 80f114b2e2d169eef2a046d112d7e8729f2c1880..552707e8e65997ebfc2120887783c4fc5698e19f 100644 (file)
--- a/convert.c
+++ b/convert.c
@@ -326,14 +326,14 @@ static int read_convert_config(const char *var, const char *value)
 
        if (!strcmp("smudge", ep)) {
                if (!value)
-                       return error("%s: lacks value", var);
+                       return config_error_nonbool(var);
                drv->smudge = strdup(value);
                return 0;
        }
 
        if (!strcmp("clean", ep)) {
                if (!value)
-                       return error("%s: lacks value", var);
+                       return config_error_nonbool(var);
                drv->clean = strdup(value);
                return 0;
        }