contrib/plugins/uftrace_symbols.py: ignore zero sized symbols

When using llvm-addr2line in replacement of addr2line, it will output
zero sized symbols, which can shadow other binaries depending on where
their location is (happens with arm-trusted-firmware and its different
binaries). Thus, ignore those symbols.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260306051553.2778652-1-pierrick.bouvier@linaro.org
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>

contrib/plugins/uftrace_symbols.py

diff --git a/contrib/plugins/uftrace_symbols.py b/contrib/plugins/uftrace_symbols.py
index 7d79b81..02d1221 100755
--- a/contrib/plugins/uftrace_symbols.py
+++ b/contrib/plugins/uftrace_symbols.py
@@ -45,6 +45,8 @@ def get_symbols(elf_file):
             continue
         addr = int(addr, 16)
         size = int(size, 16)
+        if size == 0:
+            continue
         symbols.append(Symbol(name, addr, size))
     symbols.sort(key = lambda x: x.addr)
     return symbols