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, 3 insertions, 3 deletions

diff --git a/pcp/Platform.c b/pcp/Platform.c
index 83313338..9fb3770e 100644
--- a/pcp/Platform.c
+++ b/pcp/Platform.c
@@ -472,13 +472,13 @@ unsigned int Platform_getMaxCPU(void) {
    return pcp->ncpu;
 }
 
-int Platform_getMaxPid(void) {
+pid_t Platform_getMaxPid(void) {
    if (pcp->pidmax)
       return pcp->pidmax;
 
    pmAtomValue value;
    if (Metric_values(PCP_PID_MAX, &value, 1, PM_TYPE_32) == NULL)
-      return -1;
+      return UINT_MAX;
    pcp->pidmax = value.l;
    return pcp->pidmax;
 }
diff --git a/pcp/Platform.h b/pcp/Platform.h
index ce21f845..f43ed54f 100644
--- a/pcp/Platform.h
+++ b/pcp/Platform.h
@@ -84,7 +84,7 @@ long long Platform_getBootTime(void);
 
 unsigned int Platform_getMaxCPU(void);
 
-int Platform_getMaxPid(void);
+pid_t Platform_getMaxPid(void);
 
 double Platform_setCPUValues(Meter* this, int cpu);