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libgeometry: fix incorrect use of sizeof to size matrices

I missed these two the last time i tried to correct this.

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

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

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

 void

 identity(Matrix m)

 {

-	memset(m, 0, sizeof m);

+	memset(m, 0, sizeof(Matrix));

 	m[0][0] = m[1][1] = m[2][2] = 1;

 }

@@ -154,7 +154,7 @@

 void

 identity3(Matrix3 m)

 {

-	memset(m, 0, sizeof m);

+	memset(m, 0, sizeof(Matrix3));

 	m[0][0] = m[1][1] = m[2][2] = m[3][3] = 1;

 }

-- 

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