[NFC][RISCV] Correct signed/unsigned in Comment

Author: lenary

llvm/lib/Target/RISCV/RISCVISelLowering.cpp

@@ -2525,7 +2525,8 @@ static void translateSetCCForBranch(const SDLoc &DL, SDValue &LHS, SDValue &RHS,
     case ISD::SETUGT:
       if (Subtarget.hasVendorXqcibi() && C != INT64_MAX && isUInt<16>(C + 1)) {
         // We have a branch immediate instruction for SETUGE but not SETUGT.
-        // Convert X > C to X >= C + 1, if (C + 1) is a 16-bit signed immediate.
+        // Convert X > C to X >= C + 1, if (C + 1) is a 16-bit unsigned
+        // immediate.
         RHS = DAG.getConstant(C + 1, DL, RHS.getValueType());
         CC = ISD::SETUGE;
         return;