scripts/gdb/symbols: handle module path parameters

commit 581ee79a25 ("scripts/gdb/symbols: make BPF debug info available
to GDB") added support to make BPF debug information available to GDB. 
However, the argument handling loop was slightly broken, causing it to
fail if further modules were passed.  Fix it to append these passed
modules to the instance variable after expansion.

Link: https://lkml.kernel.org/r/20260304110642.2020614-2-benjamin@sipsolutions.net
Fixes: 581ee79a25 ("scripts/gdb/symbols: make BPF debug info available to GDB")
Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Cc: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

scripts/gdb/linux/symbols.py

@@ -298,7 +298,7 @@ are loaded as well."""
             if p == "-bpf":
                 monitor_bpf = True
             else:
-                p.append(os.path.abspath(os.path.expanduser(p)))
+                self.module_paths.append(os.path.abspath(os.path.expanduser(p)))
         self.module_paths.append(os.getcwd())
 
         if self.breakpoint is not None: