riscv: Fixed kernel test robot warning

Kernel test robot throws below warning -

   arch/riscv/kernel/asm-offsets.c:14:6: warning: no previous prototype
for 'asm_offsets' [-Wmissing-prototypes]
      14 | void asm_offsets(void)
         |      ^~~~~~~~~~~

This patch should fixed it.

Reported-by: kernel test robot <[email protected]>
Signed-off-by: Souptick Joarder <[email protected]>
Signed-off-by: Palmer Dabbelt <[email protected]>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/riscv/kernel/asm-offsets.c b/arch/riscv/kernel/asm-offsets.c
index db203442c08f..b79ffa3561fd 100644
--- a/arch/riscv/kernel/asm-offsets.c
+++ b/arch/riscv/kernel/asm-offsets.c
@@ -11,6 +11,8 @@
 #include <asm/thread_info.h>
 #include <asm/ptrace.h>
 
+void asm_offsets(void);
+
 void asm_offsets(void)
 {
 	OFFSET(TASK_THREAD_RA, task_struct, thread.ra);