kbuild: fix build error during make htmldocs

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 <[email protected]>
Signed-off-by: WANG Cong <[email protected]>
Acked-by: Randy Dunlap <[email protected]>
Signed-off-by: Sam Ravnborg <[email protected]>

diff --git a/scripts/basic/docproc.c b/scripts/basic/docproc.c
index 4c9523ef9c00d0a795862cc12e23b1eda80931d2..99ca7a698687a5a0558b987b05ffb6c581c01141 100644 (file)
--- 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) {
                usage();