[mlir] Fix a warning

This patch fixes:

  mlir/lib/Conversion/ComplexCommon/DivisionConverter.cpp:61:2: error:
  extra ';' outside of a function is incompatible with C++98
  [-Werror,-Wc++98-compat-extra-semi]

Author: kazutakahirata

mlir/lib/Conversion/ComplexCommon/DivisionConverter.cpp

@@ -58,7 +58,7 @@ void mlir::complex::convertDivToStandardUsingAlgebraic(
       rewriter.create<arith::DivFOp>(loc, realNumerator, rhsSqNorm, fmf);
   *resultIm =
       rewriter.create<arith::DivFOp>(loc, imagNumerator, rhsSqNorm, fmf);
-};
+}
 
 // Smith's algorithm to divide complex numbers. It is just a bit smarter
 // way to compute the following algebraic formula: