scripts: modpost: check memory allocation results

scripts: modpost: check memory allocation results

[ Upstream commit 1f3aa9002dc6a0d59a4b599b4fc8f01cf43ef014 ]

Fix missing error check for memory allocation functions in
scripts/mod/modpost.c.

Fixes kernel bugzilla #200319:
https://bugzilla.kernel.org/show_bug.cgi?id=200319

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Yuexing Wang <wangyxlandq@gmail.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>