elf: Compile with -Wextra

-Wextra enables a bunch of rather useful checks which this fixes.

This changes the return value for the case when no ELF headers were found
to avoid (ugly-ish) cast of -1 to unsigned.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---
Changes:
v2:
* cast the return value to (int)
* added missing (long)

1 files changed, 3 insertions, 3 deletions

diff --git a/include/libelf.h b/include/libelf.h
index 48ff4d7..29a4d04 100644
--- a/include/libelf.h
+++ b/include/libelf.h
@@ -96,9 +96,9 @@ void elf_relocate64(void *file_addr, signed long offset);
 
 int elf_forth_claim(void *addr, long size);
 
-long elf_get_file_size(const void *buffer, const long buffer_size);
-long elf_get_file_size32(const void *buffer, const long buffer_size);
-long elf_get_file_size64(const void *buffer, const long buffer_size);
+long elf_get_file_size(const void *buffer, const unsigned long buffer_size);
+long elf_get_file_size32(const void *buffer, const unsigned long buffer_size);
+long elf_get_file_size64(const void *buffer, const unsigned long buffer_size);
 
 #ifdef __BIG_ENDIAN__
 #define elf64_to_cpu(x, ehdr) ((ehdr)->ei_data == ELFDATA2MSB ? (x) : bswap_64(x))