bsd-user/mmap.c: check pread's return value to fix warnings with _FOR…

…TIFY_SOURCE

Simmilar to the equivalent linux-user: commit fb7e378, which added
checking to pread's return value. Update to current qemu standards with
{} around the if statement.

Signed-off-by: Mikaël Urankar <mikael.urankar@gmail.com>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Kyle Evans <kevans@FreeBSD.org>

bsd-user/mmap.c

@@ -174,7 +174,9 @@ static int mmap_frag(abi_ulong real_start,
             mprotect(host_start, qemu_host_page_size, prot1 | PROT_WRITE);
 
         /* read the corresponding file data */
-        pread(fd, g2h_untagged(start), end - start, offset);
+        if (pread(fd, g2h_untagged(start), end - start, offset) == -1) {
+            return -1;
+        }
 
         /* put final protection */
         if (prot_new != (prot1 | PROT_WRITE))
@@ -593,7 +595,9 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
                                   -1, 0);
             if (retaddr == -1)
                 goto fail;
-            pread(fd, g2h_untagged(start), len, offset);
+            if (pread(fd, g2h_untagged(start), len, offset) == -1) {
+                goto fail;
+            }
             if (!(prot & PROT_WRITE)) {
                 ret = target_mprotect(start, len, prot);
                 if (ret != 0) {