linux-user: fix target_mprotect/target_munmap error return values

target_mprotect/target_munmap return value goes through get_errno at the
call site, thus the functions must either set errno to host error code
and return -1 or return negative guest error code. Do the latter.

Cc: qemu-stable@nongnu.org
Cc: Riku Voipio <riku.voipio@iki.fi>
Cc: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20180228221609.11265-8-jcmvbkbc@gmail.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

linux-user/mmap.c

@@ -77,11 +77,11 @@ int target_mprotect(abi_ulong start, abi_ulong len, int prot)
 #endif
 
     if ((start & ~TARGET_PAGE_MASK) != 0)
-        return -EINVAL;
+        return -TARGET_EINVAL;
     len = TARGET_PAGE_ALIGN(len);
     end = start + len;
     if (!guest_range_valid(start, len)) {
-        return -ENOMEM;
+        return -TARGET_ENOMEM;
     }
     prot &= PROT_READ | PROT_WRITE | PROT_EXEC;
     if (len == 0)
@@ -621,10 +621,10 @@ int target_munmap(abi_ulong start, abi_ulong len)
            start, len);
 #endif
     if (start & ~TARGET_PAGE_MASK)
-        return -EINVAL;
+        return -TARGET_EINVAL;
     len = TARGET_PAGE_ALIGN(len);
     if (len == 0 || !guest_range_valid(start, len)) {
-        return -EINVAL;
+        return -TARGET_EINVAL;
     }
 
     mmap_lock();