cmd: sf: fix map_physmem check

Make sure 0x00 is a valid address to read to. If `addr` is 0x00 then
map_physmem() will return 0 which should be a valid address.

Signed-off-by: Liam Beguin <liambeguin@gmail.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/cmd/sf.c b/cmd/sf.c
index f971eec781c..e7ff9a64620 100644
--- a/cmd/sf.c
+++ b/cmd/sf.c
@@ -287,7 +287,7 @@ static int do_spi_flash_read_write(int argc, char * const argv[])
 	}
 
 	buf = map_physmem(addr, len, MAP_WRBACK);
-	if (!buf) {
+	if (!buf && addr) {
 		puts("Failed to map physical memory\n");
 		return 1;
 	}