nios2: Fix unused variable warning

Fix the following compiler splat by adding __maybe_unused annotation to
the variable. Using this particular annotation has the least ugly impact
on the code compared to using ifdeffery.

arch/nios2/kernel/setup.c: In function 'nios2_boot_init':
arch/nios2/kernel/setup.c:107:7: warning: unused variable 'cmdline_passed' [-Wunused-variable]
  char cmdline_passed[COMMAND_LINE_SIZE] = { 0, };
       ^

Signed-off-by: Marek Vasut <marex@denx.de>
Acked-by: Ley Foon Tan <lftan@altera.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/nios2/kernel/setup.c b/arch/nios2/kernel/setup.c
index b101a43d3c5a..a4ff86d58d5c 100644
--- a/arch/nios2/kernel/setup.c
+++ b/arch/nios2/kernel/setup.c
@@ -104,7 +104,7 @@ asmlinkage void __init nios2_boot_init(unsigned r4, unsigned r5, unsigned r6,
                                        unsigned r7)
 {
         unsigned dtb_passed = 0;
-        char cmdline_passed[COMMAND_LINE_SIZE] = { 0, };
+        char cmdline_passed[COMMAND_LINE_SIZE] __maybe_unused = { 0, };
 
 #if defined(CONFIG_NIOS2_PASS_CMDLINE)
         if (r4 == 0x534f494e) { /* r4 is magic NIOS */