Fix finding local symbols in .dbg.locals section

FindLocal would crash if the .dbg.methods section was missing instead of just looking through the whole .dbg.locals section.

Access to array variables wasn't detected properly too.

tools/smxtools/smxdasm/Sections.cs

@@ -566,7 +566,7 @@ public SmxDebugLocals(SmxFile smx_file, FileHeader file, SectionEntry header, Sm
         public DebugVarEntry FindLocal(int codeaddr, int address)
         {
             int start_at = 0;
-            int stop_at = smx_file_.DebugMethods.Entries.Length;
+            int stop_at = Entries.Length;
             if (smx_file_.DebugMethods != null && smx_file_.RttiMethods != null)
             {
                 int? index = null;
@@ -599,7 +599,7 @@ public DebugVarEntry FindLocal(int codeaddr, int address)
                     return sym;
                 if (i == stop_at - 1)
                     break;
-                var next_sym = Entries[stop_at + 1];
+                var next_sym = Entries[i + 1];
                 if (address > sym.address && address < next_sym.address)
                     return sym;
             }