qapi: Consistent whitespace in tests/Makefile

tests/Makefile had a mix of TAB vs. 8-space indentation; given
that it is a Makefile, TAB is more idiomatic even though in these
particular cases the choice of whitespace didn't matter.
Signed-off-by: NEric Blake <eblake@redhat.com>
Reviewed-by: NMarkus Armbruster <armbru@redhat.com>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

tests/Makefile

@@ -197,23 +197,23 @@ $(foreach target,$(SYSEMU_TARGET_LIST), \
 		$(eval check-qtest-$(target)-y += tests/qom-test$(EXESUF))))
 
 check-qapi-schema-y := $(addprefix tests/qapi-schema/, \
-        comments.json empty.json funny-char.json indented-expr.json \
-        missing-colon.json missing-comma-list.json \
-        missing-comma-object.json non-objects.json \
-        qapi-schema-test.json quoted-structural-chars.json \
-        trailing-comma-list.json trailing-comma-object.json \
-        unclosed-list.json unclosed-object.json unclosed-string.json \
-        duplicate-key.json union-invalid-base.json flat-union-no-base.json \
-        flat-union-invalid-discriminator.json \
-        flat-union-invalid-branch-key.json flat-union-reverse-define.json \
-        flat-union-string-discriminator.json \
-        include-simple.json include-relpath.json include-format-err.json \
-        include-non-file.json include-no-file.json include-before-err.json \
-        include-nested-err.json include-self-cycle.json include-cycle.json \
-        include-repetition.json event-nest-struct.json)
+	comments.json empty.json funny-char.json indented-expr.json \
+	missing-colon.json missing-comma-list.json \
+	missing-comma-object.json non-objects.json \
+	qapi-schema-test.json quoted-structural-chars.json \
+	trailing-comma-list.json trailing-comma-object.json \
+	unclosed-list.json unclosed-object.json unclosed-string.json \
+	duplicate-key.json union-invalid-base.json flat-union-no-base.json \
+	flat-union-invalid-discriminator.json \
+	flat-union-invalid-branch-key.json flat-union-reverse-define.json \
+	flat-union-string-discriminator.json \
+	include-simple.json include-relpath.json include-format-err.json \
+	include-non-file.json include-no-file.json include-before-err.json \
+	include-nested-err.json include-self-cycle.json include-cycle.json \
+	include-repetition.json event-nest-struct.json)
 
 GENERATED_HEADERS += tests/test-qapi-types.h tests/test-qapi-visit.h \
-                     tests/test-qmp-commands.h tests/test-qapi-event.h
+		     tests/test-qmp-commands.h tests/test-qapi-event.h
 
 test-obj-y = tests/check-qint.o tests/check-qstring.o tests/check-qdict.o \
 	tests/check-qlist.o tests/check-qfloat.o tests/check-qjson.o \
@@ -225,7 +225,7 @@ test-obj-y = tests/check-qint.o tests/check-qstring.o tests/check-qdict.o \
 	tests/test-opts-visitor.o tests/test-qmp-event.o
 
 test-qapi-obj-y = tests/test-qapi-visit.o tests/test-qapi-types.o \
-                  tests/test-qapi-event.o
+		  tests/test-qapi-event.o
 
 $(test-obj-y): QEMU_INCLUDES += -Itests
 QEMU_CFLAGS += -I$(SRC_PATH)/tests