MIPS: Make virt_addr_valid() return bool

virt_addr_valid() really returns a boolean value, but currently uses an
integer to represent it. Switch to the bool type to make it clearer that
we really are returning a true or false value.
Signed-off-by: Paul Burton <paul.burton@mips.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Cc: linux-mips@vger.kernel.org

arch/mips/include/asm/page.h

@@ -249,7 +249,7 @@ static inline int pfn_valid(unsigned long pfn)
 #define virt_to_pfn(kaddr)   	PFN_DOWN(virt_to_phys((void *)(kaddr)))
 #define virt_to_page(kaddr)	pfn_to_page(virt_to_pfn(kaddr))
 
-extern int __virt_addr_valid(const volatile void *kaddr);
+extern bool __virt_addr_valid(const volatile void *kaddr);
 #define virt_addr_valid(kaddr)						\
 	__virt_addr_valid((const volatile void *) (kaddr))
 

arch/mips/mm/mmap.c

@@ -201,12 +201,12 @@ unsigned long arch_randomize_brk(struct mm_struct *mm)
 	return ret;
 }
 
-int __virt_addr_valid(const volatile void *kaddr)
+bool __virt_addr_valid(const volatile void *kaddr)
 {
 	unsigned long vaddr = (unsigned long)vaddr;
 
 	if ((vaddr < PAGE_OFFSET) || (vaddr >= MAP_BASE))
-		return 0;
+		return false;
 
 	return pfn_valid(PFN_DOWN(virt_to_phys(kaddr)));
 }