git-p4: Unset P4DIFF environment variable when using 'p4 -du diff'

diff --git a/interpolate.c b/interpolate.c
index 6ef53f246511a1943e375d5d5913a4ec52e2c663..7f03bd99c5b66afa6cc7fa11a2430301a3042656 100644 (file)
--- a/interpolate.c
+++ b/interpolate.c
@@ -11,8 +11,7 @@ void interp_set_entry(struct interp *table, int slot, const char *value)
        char *oldval = table[slot].value;
        char *newval = NULL;
 
-       if (oldval)
-               free(oldval);
+       free(oldval);
 
        if (value)
                newval = xstrdup(value);