os/exec: Use the built-in function min instead of minInt

The built-in function `min` has been implemented and can now be used to replace some manually written `minType` helper functions.

Change-Id: Ie8ffc7881c8652ece752751214f1242bf76a6e7e
GitHub-Last-Rev: 5db344f
GitHub-Pull-Request: #60866
Reviewed-on: https://go-review.googlesource.com/c/go/+/504315
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: qiulaidongfeng <2645477756@qq.com>

Author: apocelipes

src/os/exec/exec.go

@@ -1096,7 +1096,7 @@ func (w *prefixSuffixSaver) Write(p []byte) (n int, err error) {
 // grow larger than w.N. It returns the un-appended suffix of p.
 func (w *prefixSuffixSaver) fill(dst *[]byte, p []byte) (pRemain []byte) {
 	if remain := w.N - len(*dst); remain > 0 {
-		add := minInt(len(p), remain)
+		add := min(len(p), remain)
 		*dst = append(*dst, p[:add]...)
 		p = p[add:]
 	}
@@ -1121,13 +1121,6 @@ func (w *prefixSuffixSaver) Bytes() []byte {
 	return buf.Bytes()
 }
 
-func minInt(a, b int) int {
-	if a < b {
-		return a
-	}
-	return b
-}
-
 // environ returns a best-effort copy of the environment in which the command
 // would be run as it is currently configured. If an error occurs in computing
 // the environment, it is returned alongside the best-effort copy.