[PATCH] x86, boot: Fix missing `has_cpuflag` prototype

[Zhou Ding]

We get 1 warning when building kernel withW=1:
arch/x86/boot/compressed/cpuflags.c:4:6: warning: no previous prototype for ‘has_cpuflag’ [-Werror=missing-prototypes]
    4 | bool has_cpuflag(int flag)
      |      ^~~~~~~~~~~
Add a function declaration to cpuflags.h

Signed-off-by: Zhou Ding <zhouding@xxxxxxxxxxxxxxxxxxxx>
---
 arch/x86/boot/cpuflags.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/boot/cpuflags.h b/arch/x86/boot/cpuflags.h
index 475b8fde90f7..fdcc2aa4c3c4 100644
--- a/arch/x86/boot/cpuflags.h
+++ b/arch/x86/boot/cpuflags.h
@@ -18,5 +18,6 @@ extern u32 cpu_vendor[3];
 int has_eflag(unsigned long mask);
 void get_cpuflags(void);
 void cpuid_count(u32 id, u32 count, u32 *a, u32 *b, u32 *c, u32 *d);
+bool has_cpuflag(int flag);
 
 #endif
-- 
2.33.0