kbuild: check return value of asprintf()

Check return value of asprintf() in docsect() and exit if error
occurs. This removes following warning:

  HOSTCC  scripts/basic/docproc
scripts/basic/docproc.c: In function ‘docsect’:
scripts/basic/docproc.c:336: warning: ignoring return value of ‘asprintf’,
				declared with attribute warn_unused_result

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>

1 files changed, 4 insertions, 1 deletions

diff --git a/scripts/basic/docproc.c b/scripts/basic/docproc.c
index fc3b18d844af..98dec87974d0 100644
--- a/scripts/basic/docproc.c
+++ b/scripts/basic/docproc.c
@@ -333,7 +333,10 @@ static void docsect(char *filename, char *line)
                 if (*s == '\n')
                         *s = '\0';
 
-        asprintf(&s, "DOC: %s", line);
+        if (asprintf(&s, "DOC: %s", line) < 0) {
+                perror("asprintf");
+                exit(1);
+        }
         consume_symbol(s);
         free(s);