pan/decode: Calm an assert to a pandecode error

We'd like to see what the problem actually was...

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4025>

src/panfrost/pandecode/decode.c

@@ -2057,8 +2057,8 @@ pandecode_shader_prop(const char *name, unsigned claim, signed truth, bool fuzzy
         if (claim == truth)
                 return;
 
-        if (fuzzy)
-                assert(truth >= 0);
+        if (fuzzy && (truth < 0))
+                pandecode_msg("XXX: fuzzy %s, claimed %d, expected %d\n", name, claim, truth);
 
         if ((truth >= 0) && !fuzzy) {
                 pandecode_msg("%s: expected %s = %d, claimed %u\n",