[Patch] kbuild: fix a build error during make htmldocs

From: Amerigo Wang
Date: Fri Jun 19 2009 - 03:07:49 EST

Fix the following build error when do 'make htmldocs':

DOCPROC Documentation/DocBook/debugobjects.xml
exec /scripts/kernel-doc: No such file or directory
exec /scripts/kernel-doc: No such file or directory

Reported-by: Randy Dunlap <randy.dunlap@xxxxxxxxxx>
Signed-off-by: WANG Cong <amwang@xxxxxxxxxx>
Cc: Sam <sam@xxxxxxxxxxxx>
Acked-by: Randy Dunlap <randy.dunlap@xxxxxxxxxx>

diff --git a/scripts/basic/docproc.c b/scripts/basic/docproc.c
index 4c9523e..99ca7a6 100644
--- a/scripts/basic/docproc.c
+++ b/scripts/basic/docproc.c
@@ -385,7 +385,7 @@ int main(int argc, char *argv[])
if (!srctree)
srctree = getcwd(NULL, 0);
kernsrctree = getenv("KBUILD_SRC");
- if (!kernsrctree)
+ if (!kernsrctree || !*kernsrctree)
kernsrctree = srctree;
if (argc != 3) {
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