[PATCH v2] tools: mkimage: Fix nullptr at strchr()

[Mikhail Ilin]

 The 'file' pointer can be null. Thus, before using it in the
 strchr() function, you need to make sure that it is not null.

Fixes: d1be8f922eb3 ("mkimage: Fix variable length header support")
Signed-off-by: Mikhail Ilin <ilin.mikhail.ol at gmail.com>
---
 tools/mkimage.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/mkimage.c b/tools/mkimage.c
index 5f51d2cc89..95005d8414 100644
--- a/tools/mkimage.c
+++ b/tools/mkimage.c
@@ -509,6 +509,8 @@ int main(int argc, char **argv)
 			file = params.datafile;
 
 			for (;;) {
+				if (!file)
+					break;
 				char *sep = strchr(file, ':');
 				if (sep) {
 					*sep = '\0';
-- 
2.17.1