[PATCH] kconfig: streamline_config.pl: check defined(ENV variable) before using it

[Randy Dunlap <rdunlap@infradead.org>]

From: Randy Dunlap <rdunlap@infradead.org>

A user reported:
'Use of uninitialized value $ENV{"LMC_KEEP"} in split at
 ./scripts/kconfig/streamline_config.pl line 596.'

so first check that $ENV{LMC_KEEP} is defined before trying
to use it.

Fixes: c027b02d89fd ("streamline_config.pl: add LMC_KEEP to preserve some kconfigs")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Changbin Du <changbin.du@gmail.com>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 scripts/kconfig/streamline_config.pl |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- linux-next-20200825.orig/scripts/kconfig/streamline_config.pl
+++ linux-next-20200825/scripts/kconfig/streamline_config.pl
@@ -593,7 +593,10 @@ while ($repeat) {
 }
 
 my %setconfigs;
-my @preserved_kconfigs = split(/:/,$ENV{LMC_KEEP});
+my @preserved_kconfigs;
+if (defined($ENV{'LMC_KEEP'})) {
+	@preserved_kconfigs = split(/:/,$ENV{LMC_KEEP});
+}
 
 sub in_preserved_kconfigs {
     my $kconfig = $config2kfile{$_[0]};