riscv: Remove unnecessary int cast in variable_fls()

__builtin_clz() returns an int and casting the whole expression to int
is unnecessary. Remove it.
Signed-off-by: Thorsten Blum <thorsten.blum@toblux.com>
Signed-off-by: Yury Norov <yury.norov@gmail.com>

arch/riscv/include/asm/bitops.h

@@ -170,7 +170,7 @@ static __always_inline int variable_fls(unsigned int x)
 ({								\
 	typeof(x) x_ = (x);					\
 	__builtin_constant_p(x_) ?				\
-	 (int)((x_ != 0) ? (32 - __builtin_clz(x_)) : 0)	\
+	 ((x_ != 0) ? (32 - __builtin_clz(x_)) : 0)		\
 	 :							\
 	 variable_fls(x_);					\
 })