fix: correctly parse word instead of byte for GPR

src/disasm.rs

@@ -204,6 +204,8 @@ impl Disassembler {
     }
 
     /// Match the modrm reg bits to the GPR1 mnemonics.
+    /// GPR always has an imm value as second operand, but is available in both
+    /// Byte and Word length.
     pub fn modrm_reg_to_mnemonic(reg: u8, target: ModRmTarget, imm: OperandWidth) -> Mnemonic {
         match imm {
             OperandWidth::Byte(b) => match reg {