[Qemu-trivial] [PATCH-trivial] qemu-img: Check getchar() return value in read_password() for WIN32

[Chen Gang <gang.chen.5i5j@gmail.com>]

getchar() is a standard c library function which may return with failure
(e.g. -1), so like another platforms, also need check it under WIN32.

And make the related code match current qemu code styles, too.


Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
---
 qemu-img.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/qemu-img.c b/qemu-img.c
index c98896b..8423e8e 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -185,15 +185,21 @@ static int GCC_FMT_ATTR(2, 3) qprintf(bool quiet, const char *fmt, ...)
 static int read_password(char *buf, int buf_size)
 {
     int c, i;
+
     printf("Password: ");
     fflush(stdout);
     i = 0;
     for(;;) {
         c = getchar();
-        if (c == '\n')
+        if (c < 0) {
+            buf[i] = '\0';
+            return -1;
+        } else if (c == '\n') {
             break;
-        if (i < (buf_size - 1))
+        }
+        if (i < (buf_size - 1)) {
             buf[i++] = c;
+        }
     }
     buf[i] = '\0';
     return 0;
-- 
1.7.11.7