selftests/futex: Fix line continuation in Makefile

The Makefile lacks a couple of line continuation backslashes
in an `if' clause, which produces an error when make versions
prior to 4.x are used for building the tests.

  $ make
  make[1]: Entering directory `/[...]/linux/tools/testing/selftests/futex'
  /bin/sh: -c: line 5: syntax error: unexpected end of file
  make[1]: *** [all] Error 1
  make[1]: Leaving directory `/[...]/linux/tools/testing/selftests/futex'
  make: *** [all] Error 2
Signed-off-by: Daniel Díaz <daniel.diaz@linaro.org>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

tools/testing/selftests/futex/Makefile

@@ -12,9 +12,9 @@ all:
 		BUILD_TARGET=$(OUTPUT)/$$DIR;	\
 		mkdir $$BUILD_TARGET  -p;	\
 		make OUTPUT=$$BUILD_TARGET -C $$DIR $@;\
-		if [ -e $$DIR/$(TEST_PROGS) ]; then
-			rsync -a $$DIR/$(TEST_PROGS) $$BUILD_TARGET/;
-		fi
+		if [ -e $$DIR/$(TEST_PROGS) ]; then \
+			rsync -a $$DIR/$(TEST_PROGS) $$BUILD_TARGET/; \
+		fi \
 	done
 
 override define RUN_TESTS