board: sifive: unmatched: remove extra space in fdtfile value

Fixes: 44a792c994 ("riscv: sifive: unmatched: migrate to text environment")
Signed-off-by: Andreas Schwab <schwab@suse.de>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
diff --git a/board/sifive/unmatched/unmatched.env b/board/sifive/unmatched/unmatched.env
index 0f1e5a7..34425dc 100644
--- a/board/sifive/unmatched/unmatched.env
+++ b/board/sifive/unmatched/unmatched.env
@@ -16,4 +16,4 @@
     name=loader1,start=17K,size=1M,type=${type_guid_gpt_loader1};
     name=loader2,size=4MB,type=${type_guid_gpt_loader2};
     name=system,size=-,bootable,type=${type_guid_gpt_system};
-fdtfile= CONFIG_DEFAULT_FDT_FILE
+fdtfile=CONFIG_DEFAULT_FDT_FILE