contrib/plugins/uftrace_symbols.py: handle missing source line from addr2line

Some symbols have only a file information, and no line information. In
this case, addr2line reports '?'. Replace with 0 to guarantee consistent
data for consumers.

Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260424194451.1439316-3-pierrick.bouvier@oss.qualcomm.com
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com>

contrib/plugins/uftrace_symbols.py

@@ -70,7 +70,10 @@ def find_symbols_locations(elf_file, symbols):
         file, line = out[i].split(':')
         # addr2line may return 'line (discriminator [0-9]+)' sometimes,
         # remove this to keep only line number.
-        line = line.split(' ')[0]
+        if line == '?':
+            line = 0
+        else:
+            line = int(line.split(' ')[0])
         s.set_loc(file, line)
 
 class BinaryFile: