pan/decode: Fix "Access to unknown memory" message formatting

The format string was missing a newline.

Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8130>

src/panfrost/lib/decode.h

@@ -56,7 +56,7 @@ __pandecode_fetch_gpu_mem(const struct pandecode_mapped_memory *mem,
                 mem = pandecode_find_mapped_gpu_mem_containing(gpu_va);
 
         if (!mem) {
-                fprintf(stderr, "Access to unknown memory %" PRIx64 " in %s:%d",
+                fprintf(stderr, "Access to unknown memory %" PRIx64 " in %s:%d\n",
                         gpu_va, filename, line);
                 assert(0);
         }