fix cross compiles

process/process_darwin.go

@@ -391,7 +391,7 @@ func (p *Process) MemoryMaps(grouped bool) (*[]MemoryMapsStat, error) {
 }
 
 func Processes() ([]*Process, error) {
-	results := make([]*Process)
+	results := []*Process{}
 
 	mib := []int32{CTLKern, KernProc, KernProcAll, 0}
 	buf, length, err := common.CallSyscall(mib)

process/process_freebsd.go

@@ -279,7 +279,7 @@ func (p *Process) MemoryMaps(grouped bool) (*[]MemoryMapsStat, error) {
 }
 
 func Processes() ([]*Process, error) {
-	results := make([]*Process)
+	results := []*Process{}
 
 	mib := []int32{CTLKern, KernProc, KernProcProc, 0}
 	buf, length, err := common.CallSyscall(mib)

process/process_openbsd.go

@@ -269,7 +269,7 @@ func (p *Process) MemoryMaps(grouped bool) (*[]MemoryMapsStat, error) {
 }
 
 func Processes() ([]*Process, error) {
-	results := make([]*Process)
+	results := []*Process{}
 
 	buf, length, err := CallKernProcSyscall(KernProcAll, 0)