CpuUsage: improve performance

by moving the first `/proc/stat` query earlier

src/detection/cpuUsage/cpuUsage_linux.c

@@ -1,13 +1,16 @@
 #include "fastfetch.h"
 #include "cpuUsage.h"
 
-#include <unistd.h>
 #include <stdio.h>
 
-static const char* getCpuUsageInfo(FILE* procStat, long* inUseAll, long* totalAll)
+const char* ffGetCpuUsageInfo(long* inUseAll, long* totalAll)
 {
     long user, nice, system, idle, iowait, irq, softirq;
 
+    FILE* procStat = fopen("/proc/stat", "r");
+    if(procStat == NULL)
+        return "fopen(\"""/proc/stat\", \"r\") == NULL";
+
     if (fscanf(procStat, "cpu%ld%ld%ld%ld%ld%ld%ld", &user, &nice, &system, &idle, &iowait, &irq, &softirq) < 0)
     {
         fclose(procStat);
@@ -15,32 +18,8 @@ static const char* getCpuUsageInfo(FILE* procStat, long* inUseAll, long* totalAl
     }
     *inUseAll = user + nice + system;
     *totalAll = *inUseAll + idle + iowait + irq + softirq;
+
+    fclose(procStat);
+
     return NULL;
 }
-
-const char* ffGetCpuUsagePercent(double* result)
-{
-    FILE* procStat = fopen("/proc/stat", "r");
-    if(procStat == NULL)
-        return "fopen(\"""/proc/stat\", \"r\") == NULL";
-
-    const char* error = NULL;
-    long inUseAll1 = 0, totalAll1 = 0;
-    error = getCpuUsageInfo(procStat, &inUseAll1, &totalAll1);
-    if(error)
-        goto exit;
-
-    sleep(1);
-    rewind(procStat);
-
-    long inUseAll2 = 0, totalAll2 = 0;
-    error = getCpuUsageInfo(procStat, &inUseAll2, &totalAll2);
-    if(error)
-        goto exit;
-
-    *result = (double)(inUseAll2 - inUseAll1) / (double)(totalAll2 - totalAll1) * 100;
-
-exit:
-    fclose(procStat);
-    return error;
-}