[fs] fix crash on '#' comments in pchtxt patches (#4124)

Adds `#` as a valid pchtxt comment, and fixes a crash that could occur
when using odd-length values

This patch was sent by Adam Kittelson <adam@apathydrive.com>

Signed-off-by: crueter <crueter@eden-emu.dev>
Co-authored-by: Cole Avenue <cole@melisand.re>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4124
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: Lizzie <lizzie@eden-emu.dev>

src/common/hex_util.cpp

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: 2013 Dolphin Emulator Project
 // SPDX-FileCopyrightText: 2014 Citra Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
@@ -12,7 +15,7 @@ std::vector<u8> HexStringToVector(std::string_view str, bool little_endian) {
         for (std::size_t i = str.size() - 2; i <= str.size(); i -= 2)
             out[i / 2] = (ToHexNibble(str[i]) << 4) | ToHexNibble(str[i + 1]);
     } else {
-        for (std::size_t i = 0; i < str.size(); i += 2)
+        for (std::size_t i = 0; i + 1 < str.size(); i += 2)
             out[i / 2] = (ToHexNibble(str[i]) << 4) | ToHexNibble(str[i + 1]);
     }
     return out;

src/core/file_sys/ips_layer.cpp

@@ -256,7 +256,7 @@ void IPSwitchCompiler::Parse() {
                 const auto& patch_line = lines[++i];
 
                 // Patch line may contain comments
-                if (StartsWith(patch_line, "//")) {
+                if (StartsWith(patch_line, "//") || StartsWith(patch_line, "#")) {
                     continue;
                 }