[RISCV][NFC] Remove unnecessary {} around single statement if block

Almost too trivial to worry about, but it seems worth having consistency with
upcoming commits.

llvm-svn: 318760
diff --git a/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp b/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
index 003686a..24c6c8d 100644
--- a/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
+++ b/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
@@ -69,9 +69,8 @@
 static DecodeStatus DecodeGPRRegisterClass(MCInst &Inst, uint64_t RegNo,
                                            uint64_t Address,
                                            const void *Decoder) {
-   if (RegNo > sizeof(GPRDecoderTable)) {
+   if (RegNo > sizeof(GPRDecoderTable))
      return MCDisassembler::Fail;
-   }
 
    // We must define our own mapping from RegNo to register identifier.
    // Accessing index RegNo in the register class will work in the case that