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libgeometry: fix typo from previous commit

--- a/sys/src/libgeometry/matrix.c

+++ b/sys/src/libgeometry/matrix.c

@@ -99,7 +99,7 @@

 double

 cofactorm(Matrix m, int row, int col)

 {

-	return minorm(m, row, col)*((row+col)&1 == 0? 1: -1);

+	return minorm(m, row, col)*((row+col & 1) == 0? 1: -1);

 }

 void

@@ -272,7 +272,7 @@

 double

 cofactorm3(Matrix3 m, int row, int col)

 {

-	return minorm3(m, row, col)*((row+col)&1 == 0? 1: -1);

+	return minorm3(m, row, col)*((row+col & 1) == 0? 1: -1);

 }

 void