[PATCH] x86/msr: Fix build with older GCC versions

[Daniel Kiper]

Some older GCC versions produce following error when x86 MSR modules are build:

  In file included from commands/i386/rdmsr.c:29:0:
  ../include/grub/i386/rdmsr.h:27:29: error: no previous prototype for 
‘grub_msr_read’ [-Werror=missing-prototypes]
   extern inline grub_uint64_t grub_msr_read (grub_uint32_t msr_id)
                               ^
  cc1: all warnings being treated as errors

This is due to incorrect use of extern keyword. So, replace it with
static keyword.

Additionally, fix incorrect coding style.

Reported-by: Eric Snowberg <address@hidden>
Reported-by: adrian15 <address@hidden>
Signed-off-by: Daniel Kiper <address@hidden>
---
 include/grub/i386/rdmsr.h | 3 ++-
 include/grub/i386/wrmsr.h | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/grub/i386/rdmsr.h b/include/grub/i386/rdmsr.h
index bddb7bbbb..c0a0c717a 100644
--- a/include/grub/i386/rdmsr.h
+++ b/include/grub/i386/rdmsr.h
@@ -24,7 +24,8 @@
  *       Accessing a reserved or unimplemented MSR address results in a GP#.
  */
 
-extern inline grub_uint64_t grub_msr_read (grub_uint32_t msr_id)
+static inline grub_uint64_t
+grub_msr_read (grub_uint32_t msr_id)
 {
   grub_uint32_t low, high;
 
diff --git a/include/grub/i386/wrmsr.h b/include/grub/i386/wrmsr.h
index e14d7807f..dea60aed1 100644
--- a/include/grub/i386/wrmsr.h
+++ b/include/grub/i386/wrmsr.h
@@ -24,7 +24,8 @@
  *       Accessing a reserved or unimplemented MSR address results in a GP#.
  */
 
-extern inline void grub_msr_write(grub_uint32_t msr_id, grub_uint64_t 
msr_value)
+static inline void
+grub_msr_write(grub_uint32_t msr_id, grub_uint64_t msr_value)
 {
   grub_uint32_t low = msr_value, high = msr_value >> 32;
 
-- 
2.11.0