parseCPUInfo*: add error checking

In case the input can't be read, scanner.Scan() stops and the code is
supposed to check for error using scanner.Err(). Do that.

In other words, instead of returning half-read cpuinfo, return an error.

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

Author: kolyshkin

cpuinfo.go

@@ -183,7 +183,7 @@ func parseCPUInfoX86(info io.Reader) ([]CPUInfo, error) {
 			cpuinfo[i].PowerManagement = field[1]
 		}
 	}
-	return cpuinfo, nil
+	return cpuinfo, scanner.Err()
 }
 
 func parseCPUInfoARM(info io.Reader) ([]CPUInfo, error) {
@@ -230,7 +230,7 @@ func parseCPUInfoARM(info io.Reader) ([]CPUInfo, error) {
 		}
 	}
 
-	return cpuinfo, nil
+	return cpuinfo, scanner.Err()
 }
 
 func parseCPUInfoS390X(info io.Reader) ([]CPUInfo, error) {
@@ -298,7 +298,7 @@ func parseCPUInfoS390X(info io.Reader) ([]CPUInfo, error) {
 		}
 	}
 
-	return cpuinfo, nil
+	return cpuinfo, scanner.Err()
 }
 
 func parseCPUInfoPPC(info io.Reader) ([]CPUInfo, error) {
@@ -343,7 +343,7 @@ func parseCPUInfoPPC(info io.Reader) ([]CPUInfo, error) {
 			cpuinfo[i].CPUMHz = v
 		}
 	}
-	return cpuinfo, nil
+	return cpuinfo, scanner.Err()
 }
 
 // firstNonEmptyLine advances the scanner to the first non-empty line