[PATCH] make: don't spray static check failures all over the subdir build

["Darrick J. Wong" <darrick.wong@oracle.com>]

From: Darrick J. Wong <darrick.wong@oracle.com>

Debian package building is special -- it directly calls make -C libxfs
when building the debian-installer packages.  This means that any
variables we define in the top level Makefile don't get passed down to
subdir make processes.

This means that the new static checker support effectively runs the
first argument in $(CFLAGS) as a command, which is surprising.  Fix up
buildrules to patch out CHECK_CMD if nobody's defined it, so that direct
subdir make works again.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 include/buildrules |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/buildrules b/include/buildrules
index 83dfe05b..5c3e6eb9 100644
--- a/include/buildrules
+++ b/include/buildrules
@@ -36,6 +36,10 @@ $(SUBDIRS):
 	$(Q)$(MAKE) $(MAKEOPTS) -q -C $@ || $(MAKE) $(MAKEOPTS) -C $@
 endif
 
+ifndef CHECK_CMD
+CHECK_CMD = @true
+endif
+
 #
 # Standard targets
 #