Couple missing branches for sqrtm and solve (#227)

Author: kshyatt

test/solve.jl

@@ -54,5 +54,8 @@ end
         @test SX isa StaticMatrix # test not falling back to Base
         @test SX ≈ X
         @test eltype(SX) == eltype(X)
+    
+        v_bad = @SVector ones(n+1)
+        @test_throws DimensionMismatch A\v_bad
     end
 end

test/sqrtm.jl

@@ -3,5 +3,6 @@
     @test sqrtm(@SMatrix [5 2; -2 1])::SMatrix ≈ sqrtm([5 2; -2 1])
     @test sqrtm(@SMatrix [4 2; -2 1])::SMatrix ≈ sqrtm([4 2; -2 1])
     @test sqrtm(@SMatrix [4 2; 2 1])::SMatrix ≈ sqrtm([4 2; 2 1])
+    @test sqrtm(@SMatrix [0 0; 0 0])::SMatrix ≈ sqrtm([0 0; 0 0])
     @test sqrtm(@SMatrix [1 2 0; 2 1 0; 0 0 1])::SizedArray{Tuple{3,3}} ≈ sqrtm([1 2 0; 2 1 0; 0 0 1])
 end