Correct pid_t type return from Platform_getMaxPid function

Coverity scanning shows we end up passing an integer into the
Row_setPidColumnWidth routine which requires a pid_t - update
each platform to return the correct type (and never return -1
as a failure code, this was being ignored).

2 files changed, 6 insertions, 3 deletions

diff --git a/unsupported/Platform.c b/unsupported/Platform.c
index df7f3600..dbfddd91 100644
--- a/unsupported/Platform.c
+++ b/unsupported/Platform.c
@@ -102,8 +102,8 @@ void Platform_getLoadAverage(double* one, double* five, double* fifteen) {
    *fifteen = 0;
 }
 
-int Platform_getMaxPid(void) {
-   return 1;
+pid_t Platform_getMaxPid(void) {
+   return INT_MAX;
 }
 
 double Platform_setCPUValues(Meter* this, unsigned int cpu) {
diff --git a/unsupported/Platform.h b/unsupported/Platform.h
index 8e08dc23..c4cd06a0 100644
--- a/unsupported/Platform.h
+++ b/unsupported/Platform.h
@@ -8,6 +8,9 @@ Released under the GNU GPLv2+, see the COPYING file
 in the source distribution for its full text.
 */
 
+#include <stdbool.h>
+#include <sys/types.h>
+
 #include "Action.h"
 #include "BatteryMeter.h"
 #include "DiskIOMeter.h"
@@ -40,7 +43,7 @@ int Platform_getUptime(void);
 
 void Platform_getLoadAverage(double* one, double* five, double* fifteen);
 
-int Platform_getMaxPid(void);
+pid_t Platform_getMaxPid(void);
 
 double Platform_setCPUValues(Meter* this, unsigned int cpu);