First coarse run to fix coding style in locm3.

Added --terse and --mailback options to the make stylecheck target. It
also does continue even if it enounters a possible error.

We decided on two exceptions from the linux kernel coding standard:
- Empty wait while loops may end with ; on the same line.
- All blocks after while, if, for have to be in brackets even if they
  only contain one statement. Otherwise it is easy to introduce an
  error.

Checkpatch needs to be adapted to reflect those changes.

lib/cm3/sync.c

@@ -19,18 +19,18 @@
 
 #include <libopencm3/cm3/sync.h>
 
-u32 __ldrex(volatile u32* addr)
+u32 __ldrex(volatile u32 *addr)
 {
 	u32 res;
 	__asm__ volatile ("ldrex %0, [%1]" : "=r" (res) : "r" (addr));
 	return res;
 }
 
-u32 __strex(u32 val, volatile u32* addr)
+u32 __strex(u32 val, volatile u32 *addr)
 {
 	u32 res;
-	__asm__ volatile ("strex %0, %2, [%1]" :
-										"=&r" (res) : "r" (addr), "r" (val));
+	__asm__ volatile ("strex %0, %2, [%1]"
+			  : "=&r" (res) : "r" (addr), "r" (val));
 	return res;
 }
 
@@ -39,7 +39,7 @@ void __dmb()
 	__asm__ volatile ("dmb");
 }
 
-void mutex_lock(mutex_t* m)
+void mutex_lock(mutex_t *m)
 {
 	u32 status = 0;
 
@@ -57,7 +57,7 @@ void mutex_lock(mutex_t* m)
 	__dmb();
 }
 
-void mutex_unlock(mutex_t* m)
+void mutex_unlock(mutex_t *m)
 {
 	__dmb();