[git commit] read_key(): placate "warning: shifting a negative signed value is undefined"

[Denys Vlasenko]

commit: https://git.busybox.net/busybox/commit/?id=f39a71817ead331b664bc658ac26dec4ec3b75bc
branch: https://git.busybox.net/busybox/commit/?id=refs/heads/master

Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
 libbb/read_key.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libbb/read_key.c b/libbb/read_key.c
index 951786869..03b7da656 100644
--- a/libbb/read_key.c
+++ b/libbb/read_key.c
@@ -259,7 +259,8 @@ int64_t FAST_FUNC read_key(int fd, char *buffer, int timeout)
 
 			buffer[-1] = 0;
 			/* Pack into "1 <row15bits> <col16bits>" 32-bit sequence */
-			col |= (((-1 << 15) | row) << 16);
+			row |= ((unsigned)(-1) << 15);
+			col |= (row << 16);
 			/* Return it in high-order word */
 			return ((int64_t) col << 32) | (uint32_t)KEYCODE_CURSOR_POS;
 		}