msvcrt/tests: remove useless assignment (LLVM/Clang)

[Austin English]

-- 
-Austin
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diff --git a/dlls/msvcrt/tests/string.c b/dlls/msvcrt/tests/string.c
index b003f5a..c532fce 100644
--- a/dlls/msvcrt/tests/string.c
+++ b/dlls/msvcrt/tests/string.c
@@ -1176,7 +1176,7 @@ static void test__strtod(void)
     ok(almost_equal(d, 0.1e-4736L), "d = %lf\n", d);
 
     errno = 0xdeadbeef;
-    d = strtod(overflow, &end);
+    strtod(overflow, &end);
     ok(errno == ERANGE, "errno = %x\n", errno);
     ok(end == overflow+21, "incorrect end (%d)\n", (int)(end-overflow));