[PATCH] Fix unused return value warnings

[ameya.palande@xxxxxxxxx (Ameya Palande)]

From: Ameya Palande <ameya.palande@xxxxxxxxx>
This patch fixes following warning:

kexec/firmware_memmap.c: In function ?parse_numeric_sysfs?:
kexec/firmware_memmap.c:70: error: ignoring return value of ?fgets?, declared
with attribute warn_unused_result
kexec/firmware_memmap.c: In function ?parse_string_sysfs?:
kexec/firmware_memmap.c:103: error: ignoring return value of ?fgets?, declared
with attribute warn_unused_result

Signed-off-by: Ameya Palande <ameya.palande at nokia.com>
---
 kexec/firmware_memmap.c |   32 +++++++++++++++++++-------------
 1 files changed, 19 insertions(+), 13 deletions(-)

diff --git a/kexec/firmware_memmap.c b/kexec/firmware_memmap.c
index 5a101fb..70e0f74 100644
--- a/kexec/firmware_memmap.c
+++ b/kexec/firmware_memmap.c
@@ -67,11 +67,14 @@ static unsigned long long parse_numeric_sysfs(const char *filename)
 		return ULLONG_MAX;
 	}
 
-	fgets(linebuffer, BUFSIZ, fp);
-	linebuffer[BUFSIZ-1] = 0;
+	if(fgets(linebuffer, BUFSIZ, fp)) {
+		linebuffer[BUFSIZ-1] = 0;
 
-	/* let strtoll() detect the base */
-	retval = strtoll(linebuffer, NULL, 0);
+		/* let strtoll() detect the base */
+		retval = strtoll(linebuffer, NULL, 0);
+	} else {
+		retval = ULLONG_MAX;
+	}
 
 	fclose(fp);
 
@@ -100,18 +103,21 @@ static char *parse_string_sysfs(const char *filename)
 		return NULL;
 	}
 
-	fgets(linebuffer, BUFSIZ, fp);
-	linebuffer[BUFSIZ-1] = 0;
-
-	/* truncate trailing newline(s) */
-	end = linebuffer + strlen(linebuffer) - 1;
-	while (*end == '\n')
-		*end-- = 0;
+	if (fgets(linebuffer, BUFSIZ, fp)) {
+		linebuffer[BUFSIZ-1] = 0;
 
-	fclose(fp);
+		/* truncate trailing newline(s) */
+		end = linebuffer + strlen(linebuffer) - 1;
 
-	return linebuffer;
+		while (*end == '\n')
+			*end-- = 0;
 
+		fclose(fp);
+		return linebuffer;
+	} else {
+		fclose(fp);
+		return NULL;
+	}
 }
 
 static int parse_memmap_entry(const char *entry, struct memory_range *range)
-- 
1.6.3.3