[git commit] bc: tweak bc_num_parseDecimal() for readability, logic is not changed

[Denys Vlasenko]

commit: https://git.busybox.net/busybox/commit/?id=87b49beeda51ef708e5b83c908edeab1ca88339b
branch: https://git.busybox.net/busybox/commit/?id=refs/heads/master

function                                             old     new   delta
zbc_program_num                                      836     835      -1

Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
 miscutils/bc.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/miscutils/bc.c b/miscutils/bc.c
index 547af8eaf..2e8d04460 100644
--- a/miscutils/bc.c
+++ b/miscutils/bc.c
@@ -2334,13 +2334,13 @@ static void bc_num_parseDecimal(BcNum *n, const char *val)
 				n->num[n->len] = val[i] - '0';
 				++n->len;
  skip_dot:
-				if ((ssize_t)--i == (ssize_t)-1) break;
-				if (val[i] == '.') goto skip_dot;
+				if (i == 0) break;
+				if (val[--i] == '.') goto skip_dot;
 			}
 			break;
 		}
 	}
-	// if this is reached, the value is entirely zero
+	// if for() exits without hitting if(), the value is entirely zero
 }
 
 // Note: n is already "bc_num_zero()"ed,